Hotel (Hotel_No, Name, Address)
Room (Room_No, Hotel_No, Type, Price)
Booking (Hotel_No, Guest_No, Date_To, Room_No)
Guest (Guest _No, Name, Address)
Generate the relational algefor the following
quer
Answers
a. List all hotels:
π Hotel_No, Name, Address (Hotel)
b. List all single rooms with a price below N20,000 per night:
σ Type = 'Single' ∧ Price < 20000 (Room)
c. List the names and address of all guests:
π Name, Address (Guest)
d. List the price and type of all rooms at the star Hotel:
π Type, Price (σ Hotel_No = starHotel_No ∧ Type = 'Single' (Room))
e. List all guests currently staying at the star Hotel:
π Guest_No (σ Hotel_No = starHotel_No (Booking))
f. List the details of all rooms at the star Hotel, including the name of the guest staying in the room, if the room is occupied:
(Room ⨝ Hotel_No = starHotel_No (Booking)) ⨝ Guest_No = Guest_No Guest
g. List the guest details (Guest_No, Name, and Address) of all guests staying at the star Hotel:
π Guest_No, Name, Address (Guest ⨝ Guest_No = Guest_No (σ Hotel_No = starHotel_No (Booking)))
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Question: Hotel (Hotel_No, Name, Address)
Room (Room_No, Hotel_No, Type, Price)
Booking (Hotel_No, Guest_No, Date_To, Room_No)
Guest (Guest _No, Name, Address)
Generate the relational algefor the following queries
a. List all hotels
b. List all single rooms with a price below N20,000 per night
c. List the names and address of all guests
d. List the price and type of all rooms at the star Hotel
e. List all guests currently staying at the star Hotel
f. List the details of all rooms at the star Hotel, including the nameof the guest staying in the room, if the room is occupied
g. List the guest details (Guest_No, Name, and Address) of all guests staying at the star Hotel.
Related Questions
What are the job responsibilities of two types of managers in the web development team?
the communicates with team members and clients and tracks schedule of whole project, whereas the leads the team of web designers and manages web development.
Answers
Answer:
you should akways measure your following distance in
Explanation:
A seconds
B car lengths
C feet
where do today’s computers store almost all motherboard configuration data? group of answer choices hdd
Answers
Today computer store almost all motherboard configuration data on CMOS chip. So option a is correct.
Today's computers store almost all motherboard configuration data on a small chip called the "CMOS" (Complementary Metal-Oxide Semiconductor) chip. This chip is located on the motherboard and is powered by a small battery. The CMOS chip stores data such as the system time and date, as well as hardware settings for the computer.
This allows the computer to retain important configuration data even when it is powered off. So, the correct answer is not the HDD (Hard Disk Drive), but rather the CMOS chip on the motherboard.
The complete question is given below:
"
where do today’s computers store almost all motherboard configuration data? group of answer choices hdd
a. CMOS
B. Hard disk
C. RAM
D. ROM
"
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Usability is _____.
a debugging technique that uses print statements to trace the program flow
a debugging technique that uses print statements to trace the program flow
the degree to which a program meets the needs of a user, including but not limited to learnability, reliability, and ease of use
the degree to which a program meets the needs of a user, including but not limited to learnability, reliability, and ease of use
a testing method that uses a program that tests another program
a testing method that uses a program that tests another program
conforming to accepted standards of behavior
conforming to accepted standards of behavior
Answers
Answer:
C) Usability is a testing method that uses a program that tests another program.
Explanation:
Hope it helps! =D
Answer: the degree to which a program meets the needs of a user, including but not limited to learnability, reliability, and ease of use
Java
Write a program Checkerboard that takes an integer command-line argu-
ment n and uses a loop nested within a loop to print out a two-dimensional n-by-n
checkerboard pattern with alternating spaces and asterisks.
Answers
public static void main(String[] args) {
int n = Integer.parseInt(args[0]);
for (int i = 0; i < n; i++) {
for (int j = 0; j < n; j++) {
if ((i + j) % 2 == 0) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
}
}
}
The program takes an integer command-line argument n and uses two nested loops to print out an n-by-n checkerboard pattern. The if statement inside the inner loop checks if the sum of the current row index i and column index j is even, and if so, it prints an asterisk. Otherwise, it prints a space.
Kevin enjoys taking apart electronics and putting them back together. Which occupation would work for Kevin? (2 points)
Group of answer choices
Accountant
Graphic designer
Marketing manager
Technician
Answers
Kevin enjoys taking apart electronics and putting them back together Technician occupation would work for Kevin.
What is the Technician ?A technician is an individual who possesses a wide range of professional skills and knowledge in a particular field, such as engineering, information technology (IT), medical technology, laboratory technology, and many others. They work in various industries and settings, including hospitals, schools, businesses, and research and development centers. Technicians use their expertise to solve technical problems, build and maintain systems, diagnose and repair equipment, and provide technical advice and support to customers. They often work with other professionals to ensure that systems and systems-related processes are running smoothly. Technicians use their technical knowledge to develop solutions to problems, analyze data, and create and maintain databases.
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Answer:
Technician
Explanation:
I got it right on the test
According to the video case discussing economic opportunities to make money with ar, vr, and 360 video content, what is the major difference between virtual reality and 360 video?.
Answers
Answer:
By 2030, VR and AR might add up to $1.5 trillion to the global GDP. By 2030, the global economy might benefit from VR and AR to the tune of $1.5 trillion. The main outcome of the PwC economists' economic impact analysis for this study is that.
Explanation:
Hope this helps
What is normally disabled by default on most Linux servers?
O TUI
O laas
O GUI
O Embedded Linux
Answers
The Option that is normally disabled by default on most Linux servers is GUI.
Is Linux an embedded OS?Embedded Linux is known to be a kind of Linux operating system as well as a kernel that is set up to be place or installed and known to be used inside embedded devices as well as other appliances.
It is seen as a kind of compact type of Linux that gives features and services in line with the operating system.
Therefore, The one that is normally disabled by default on most Linux servers is GUI.
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let us assume we have a special computer. each word is two bytes. the memory is byte addressable. the length of the memory address is 40 bits. what is the largest memory size supported by this computer?
Answers
The largest memory size supported by this computer 2^40 = 1TB.
What do you mean by memory address?
A memory address is a reference to a particular memory region that is utilized by hardware and software at different levels. Memory addresses are unsigned numbers that are often presented and handled as fixed-length digit sequences.
What is address bit?
A memory index is a major storage address. A single byte's address is represented as a 32-bit address. An address is present on 32 bus wires (there are many more bus wires for timing and control). Addresses like 0x2000, which appear to be a pattern of just 16 bits, are occasionally mentioned.
Let's considering 8 bit word size or unit size
8 bit = 2^(3) bit
2^(10)bit = 1024bit = 1kb
2^(20)bit = 1024kb = 1mb
2^(30) → 1gb
2^(40) → 1 tb
Therefore, the largest memory size is 1TB.
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print 3 numbers before asking a user to input an integer
Answers
Answer:
you can use an array to do this
Explanation:
(I've written this in java - I think it should work out):
Scanner input = new Scanner(System.in);
System.out.println("Enter an integer: ");
int userInt = input.nextInt();
int[] array = new int[userInt - 1];
for(int i = userInt-1; i < userInt; i--)
System.out.println(array[i]);
For ul elements nested within the nav element, set the list-style-type to none and set the line-height to 2em.
For all hypertext links in the document, set the font-color to ivory and set the text-decoration to none.
(CSS)
Answers
Using the knowledge in computational language in html it is possible to write a code that For ul elements nested within the nav element, set the list-style-type to none and set the line-height to 2em.
Writting the code:<!doctype html>
<html lang="en">
<head>
<!--
<meta charset="utf-8">
<title>Coding Challenge 2-2</title>
</head>
<body>
<header>
<h1>Sports Talk</h1>
</header>
<nav>
<h1>Top Ten Sports Websites</h1>
<ul>
</ul>
</nav>
<article>
<h1>Jenkins on Ice</h1>
<p>Retired NBA star Dennis Jenkins announced today that he has signed
a contract with Long Sleep to have his body frozen before death, to
be revived only when medical science has discovered a cure to the
aging process.</p>
always-entertaining Jenkins, 'I just want to return once they can give
me back my eternal youth.' [sic] Perhaps Jenkins is also hoping medical
science can cure his free-throw shooting - 47% and falling during his
last year in the league.</p>
<p>A reader tells us that Jenkins may not be aware that part of the
least-valuable asset.</p>
</article>
</body>
</html>
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I need help plz!! Idk the answer
Answers
Answer:
load handling
Explanation:
how do I fix this plz help will mark brainliast
Answers
Hope this helped
how would i put a min function in this code?
largest = int(input("Enter a number: "))
print("Largest: {}".format(largest))
i = 0
while i < 5:
num = int(input("Enter a number: "))
if num > largest:
largest = num
print("Largest: {}".format(largest))
i += 1
Answers
Using the knowledge in computational language in python it is possible to write a code that that repeatedly prompts a user for integer numbers until the user enters 'done'. Once 'done' is entered, print out the largest and smallest of the numbers.
Writting the code:largest = None
smallest = None
while True:
num = input("Enter a number: ")
if num == "done":
break
try:
num = int(num)
if largest is None or largest < num:
largest = num
if smallest is None or smallest > num:
smallest = num
except:
print('Invalid input')
continue
print("Maximum is", largest)
print("Minimum is", smallest)
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the users in a company have reported intermittent connectivity issues. when the network technician asked the users to detail the issue, they said the issue is frequent, happens anytime, and the cause is unknown. while troubleshooting, the network technician discovered that the ethernet cable was running parallel to the electric cable. what can be the cause of the issue mentioned in the given scenario? this type of question contains radio buttons and checkboxes for selection of options. use tab for navigation and enter or space to select the option.
Answers
The cause of the issue mentioned in the given scenario where users have reported intermittent connectivity issues is electromagnetic interference (EMI).
When the network technician discovered that the ethernet cable was running parallel to the electric cable, it indicated that EMI was occurring. EMI is a phenomenon that occurs when electronic devices emit or receive electromagnetic waves, which can interfere with other electronic devices or cables nearby that are carrying signals.
The cause of the connectivity issue is electromagnetic interference. When two cables, such as an Ethernet cable and an electric cable, run parallel to one another, the electric cable creates a magnetic field. When the Ethernet cable passes through the magnetic field, it induces an electrical current in the Ethernet cable, causing interference, which disrupts the signal transmitted over the cable. As a result, the users of the company have reported intermittent connectivity issues. To address the issue, the network technician must reroute the Ethernet cable to avoid running parallel to the electric cable.
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The issue mentioned in the given scenario is caused by electromagnetic interference (EMI).
The users in a company have reported intermittent connectivity issues. When the network technician asked the users to detail the issue, they said the issue is frequent, happens anytime, and the cause is unknown. While troubleshooting, the network technician discovered that the ethernet cable was running parallel to the electric cable. The cause of the issue mentioned in the given scenario is electromagnetic interference (EMI).
EMI is the disruption of the normal operation of an electronic device caused by the electromagnetism of another device. The issue occurs due to the electric currents that are induced in one conductor by the magnetic field produced by the current flowing through another conductor. EMI can be caused by anything from nearby motors to lightning strikes.
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Computer system with a 32-bit logical address and 4k-byte page size. assume that each entry of a page table consists of 4bytes.
a. suppose that this system supports up to 64mb of physical memory.
how many bits are there in the physical address?
how many entries are there un a page table?
if this system uses a one-level paging scherne, what is the size of page table?
b. suppose that this system supports up to 2^30 bytes of physical memory.
if this system uses a conventional single-level page tavle, what would the size of a page table be?
if we want the size of each page table to be no gather than the page size(4kb), what scheme would you want to use?
Answers
The number of bits in the physical address is 26 bits. The number of entries in a page table is \(\mathbf{2^{20}}\) entries. The size of the page table in a one-level paging scheme is 4MB.
What is paging in Operating System?
Paging is a storage method used in operating systems to recover activities as pages from secondary storage and place them in primary memory. The basic purpose of pagination is to separate each procedure into pages.
We are given the following parameters:
32-bit logical addressPage size = 4 KB = \(\mathbf{2^{12} \ bytes }\)Size of each Page table entry = 4 bytesSuppose the system supports physical memory size = 64 MB = \(\mathbf{2^{26} \ bytes}\)
Thus, the number of bits in the physical address is computed as:
= \(\mathbf{log_2 \{Physical-memory-size\}}\)
\(=\mathbf{log_2(2^{26})}}\)
= 26 bits
The number of entries in a page table = logical address space size/page size
The number of entries in a page table \(\mathbf{= \dfrac{2^{32}}{2^{12}}}\)
\(\mathbf{=2^{20}}\) entries
In a one-level paging scheme, the size of the table is:
= entire no. of page entries × page table size
= \(\mathbf{2^{20}\times 4 \ bytes}\)
= 4 MB
b.
suppose that this system supports up to 2^30 bytes of physical memory.
The size of the page table will be the same as 4 MB due to the fact that the number of entries, as well as, the page table entry size is the same.Since the size of the page table surpasses that of a single page. A page cannot include a whole page table. Therefore, the page table must be broken into parts to fit onto numerous pages, and an additional level of the page table is required to access this page table.
This is called the Multi-Level Paging system.Therefore, we can conclude that the number of bits in the physical address is 26 bits, the number of entries in a page table is \(\mathbf{2^{20}}\) entries, and the size of the page table in a one-level paging scheme is 4MB.
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What does the program print out as a result of the given snippet of code?
supplies = ["pencil", "notebook", "backpack", "calculator", "pen"]
print(len(supplies))
5
8
[‘backpack’, ‘calculator’, ‘notebook’, ‘pen’, ‘pencil’]
[‘pencil’, ‘notebook’, ‘backpack’, ‘calculator’, ‘pen’]
Answers
Answer:
5
Explanation:
well the function len gives the length of the list
so the length of supplies is
5
Answer:
a
Explanation:
edge
Digital Onboarding at Adobe The first day of a new job for individuals everywhere represents more than just employment: hope, a new start, a next step, a chosen path, and a better future. Positioning employees for success, new-hire orientation at Adobe—what Adobe calls New Employee Success—has been refined into a holistic experience that familiarizes personnel with critical guidelines, stirs creativity and innovation, as well as garners satisfaction and engagement. To achieve all of these objectives, Adobe conducts new employee orientation using Adobe Connect. At the weekly digital orientation, the company brings employees together to share a common understanding and vision for the company’s future. By transforming new-hire orientation from locally facilitated events to a standard, shared virtual experience, Adobe is better supporting its growing workforce by syndicating core cultural themes around values and collaboration more consistently, without sacrificing user experience. Connecting dispersed employees to each other and the orientation experience requires more than compelling content. "Digital content is always evolving and Adobe Connect provides an extensible platform that allows us to plug and play new digital content as it becomes available. This is especially true of video media," says Justin Mass, head of digital learning innovation at Adobe. "Adobe Connect gives us more flexibility and creativity with how we present information and ideas, as well as continually evolve our digital learning experiences." Creating an engaging experience online is challenging without the right toolset, since it is easy for people to get distracted with day-to-day business happening around them. By empowering presenters to reach participants one to one, they can maintain focus on the discussion. Adobe Connect is also unique in offering presenters complete control over the user interface and tools. For example, facilitators can activate several chat pods to be running side by side to compare and contrast ideas. Activities, games, and other types of interactivity can be woven throughout the session, so participants are helping shape the content and experience itself, making sessions truly immersive. "To deliver virtual learning at scale, facilitators need to find different ways to draw on the experience and insights of participants," says Mass. "Adobe Connect transforms participants into co-presenters because of the ease of use and unique tools that facilitate interactivity, helping to share knowledge across the organization in a way previously unimagined." Refer to the full case study at https://www.adobe.com/content/dam/cc/us/en/products/adobeconnect/customer-success/pdfs/adobe-adobe-connect-case-study.pdf Case Study Questions: Question 1.1: Identify five best practices from Adobe leveraging digital technology to provide the best possible onboarding experience to its global workforce. Question 1: What are the potential limitations of the digital technologies embedded in these best practices? Question 1: How transferable are these best practices to other geographies, industries, and organisations? Question 1: What kind of learning and work environment do these best practices require to be successful?
Answers
Identify five best practices from Adobe leveraging digital technology to provide the best possible onboarding experience to its global workforce.
Utilizing Adobe Connect for virtual new-hire orientation: Adobe Connect is a digital platform that enables Adobe to conduct new employee orientation virtually, allowing employees from around the world to participate in a shared experience. This eliminates the need for locally facilitated events and ensures consistency in onboarding practices.
Syndicating core cultural themes through digital content: Adobe Connect's extensible platform allows Adobe to easily incorporate new digital content, such as videos, into their onboarding process. This enables them to consistently communicate and reinforce their core cultural themes, values, and collaboration across their global workforce.
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Jake really works well with numbers and is skilled with computers but doesn't work well with others. Which of the jobs discussed in this unit might be best for Jake? Why?
Answers
Answer:
Repair Technician (this is a guess, since im also on this)
Explanation:
A repair technician work alone most of the time and since he is good with computers, he can fix computers and not have to worry about working with others if he is too good at it, since he will satisfy so many customers and make alot of money if it is based on fixing a problem on a Computer. Since he is good with numbers, he will be able to count the fee from him having to work and fix something based on what it is.
The physical components of a computer are called hardware
Answers
Answer: Yes
Explanation:
Computer hardware includes the physical parts of a computer, such as the case, central processing unit (CPU), monitor, mouse, keyboard, computer data storage, graphics card, sound card, speakers and motherboard. It is very important to have these parts, without them, your computer will not work.
The physical components of a computer are called "hardware."
Computer hardware refers to all the tangible parts of a computer system that you can see and touch. These components work together to process data and perform tasks.
Some common examples of computer hardware include:
1. Central Processing Unit (CPU): The CPU is the "brain" of the computer, responsible for executing instructions and performing calculations.
2. Random Access Memory (RAM): RAM is the temporary memory used to store data and instructions that the CPU is currently processing.
3. Hard Disk Drive (HDD) or Solid-State Drive (SSD): These are storage devices used to store permanent data and files on the computer.
4. Motherboard: The motherboard is the main circuit board that connects and allows communication between various hardware components.
5. Graphics Processing Unit (GPU): The GPU handles graphics and video processing, making it essential for tasks like gaming and video editing.
6. Power Supply Unit (PSU): The PSU supplies power to the various components of the computer.
7. Monitor: The monitor is the display screen that allows users to see the output from the computer.
8. Keyboard and Mouse: Input devices used to interact with the computer and input data.
9. Optical Drives: These devices are used to read and write CDs, DVDs, and Blu-ray discs.
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The question attached here seems to be incomplete, the complete question is:
The physical components of a computer are called ________.
Identify the part of the information processing cycle described by each of the items below. A student types text into a word processing program. The computer checks and compares all words entered to find misspellings. > The computer shows possible misspellings on the screen. You save the revised document to the hard disk. < CDs and DVDs are examples of DONE 4 of 7
Answers
the answers are:
- input
- processing
- output
- storage
- storage
Answer:
- input
- processing
- output
- storage
- storage
Explanation:
Write a program that uses 5 threads. initialize a shared variable with a value of 100.
Answers
Create a multithreaded program with 5 threads sharing a single variable initialized to 100, using synchronization mechanisms to prevent data inconsistencies.
To write a program using 5 threads and a shared variable initialized to 100, follow these steps:
1. Choose a programming language (e.g., Python, Java, C++).
2. Import necessary threading libraries (e.g., "threading" in Python, "java.lang" in Java).
3. Define a function or class that handles the shared variable and any operations that need to be performed.
4. Create a synchronization mechanism (e.g., locks, semaphores) to ensure that the shared variable is accessed safely by multiple threads without conflicts.
5. Initialize the shared variable with a value of 100.
6. Create 5 threads, each executing the function or class defined earlier.
7. Start all the threads and have them perform their tasks.
8. Join the threads to the main thread, ensuring that all threads complete their execution before the main thread ends.
9. (Optional) Print the final value of the shared variable to verify the program's behavior.
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Select the correct answer. Which is the output of the formula =XOR(120<102;83=83;51<24)? A. TRUE B. FALSE C. 83 D. 24 E. 120
Answers
Answer:
A. TRUE
Explanation:
The XOR formula is a logical operator that returns TRUE if one of the expressions is true and the other is false, and it returns false if both expressions are true or false.
In this case the formula =XOR(120<102;83=83;51<24) calculates
120<102 =FALSE;
83=83 = TRUE;
51<24 = FALSE;
As only one of the expressions is true and the other two are false, the XOR formula returns TRUE.
Write a function named last_digit that returns the last digit of an integer. For example, last_digit(3572) should return 2. It should work for negative numbers as well; last_digit(-947) should return 7.
Answers
def last_digit(num):
num = str(num)
return int(num[-1])
print(last_digit(-947))
I hope this helps!
A student is doing research comparing mothers who work outside the home versus mothers who do not have an outside job. The student thinks that both ways are fine and hopes to find evidence that children are successful in both scenarios. One website claims that all mothers need to work outside the home and to do otherwise is deplorable. What is the most obvious characteristic this website lacks?
This website lacks blank
pls help asap
Answers
Answer:
they need some travis scott in their life
Explanation:
Which Annotation tool provides the ability to convert the mouse icon when giving a presentation to better focus the audience attention?
1. Arrow
2. Ink Color
3. Eraser
4. Laser Pointer
Answers
for the system state shown above, determine if a new request by process p2 for 6 units of resource r2 can be safely granted. (remark: you can assume that the system state above does not yet take into account this request.). explain your reasoning. if the request cannot be safely granted, how should the system behave with respect to the request?
Answers
c. We have Available = 2 6 7 and P2 is requesting 0 0 5
How to solve the system requestSo now Available becomes = 2 6 2 and Need matrix becomes:
4 0 0
1 1 3
4 4 7 (P2)
0 1 3
We will now check if the system is in safe state.
P1 can't be granted as we have already seen in above parts due to lack of R0
Check for P1:
1 1 3 <= 2 6 2 (No, R2 can't be granted)
Check for P2:
4 4 7 <= 2 6 2 (No, R2 can't be granted)
Check for P3:
0 1 3 <= 2 6 2 (No, R2 can't be granted)
As we can see that we can't find a safe sequence which means that the system is in an unsafe state. Thus, a request by P2 for 5 units of R2 cannot be fulfilled.
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The Wi-Fi Protected Access (WPA2) uses _____ to obtain a master key, which is in turn used to negotiate for a key that will be used for a session.a. Internet Protocol (IP) address b. Service Set Identifier (SSID) c. Wired Equivalent Privacy (WEP)
d. Extensible Authentication Protocol (EAP)
Answers
The Wi-Fi Protected Access (WPA2) uses Extensible Authentication Protocol (EAP) to obtain a master key, which is in turn used to negotiate for a key that will be used for a session.
What is an authentication?
Authentication is the process of verifying the identity of a user. It typically involves the use of credentials data to ensure that the requester is who or what they claim to be.
What is the master key?
A master key is a cryptographic key that can unlock or decrypt multiple other keys or files. It is used in various security systems to simplify key management and enhance security.
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a __________ is a collection of data records in a centralized database or a synchronized distributed database, defined to be authoritative within the organization.
Answers
A data warehouse is a collection of data records in a centralized database or a synchronized distributed database, defined to be authoritative within the organization.
This repository is a large and well-organized store of data that is used to guide the decision-making process within the company. Data warehousing is a process that involves the consolidation of data from multiple sources into a central location, which is then used to guide decision-making activities. A data warehouse is a collection of data records in a centralized database or a synchronized distributed database, defined to be authoritative within the organization.
A data warehouse is an essential tool for organizations that need to manage large volumes of data. These tools help organizations to efficiently consolidate data from various sources into a central location. The purpose of this is to provide a single source of truth for the organization. This means that all users within the organization can access and utilize the same data for their decision-making activities. The data within a data warehouse is well organized and structured. The information contained within a data warehouse is optimized for use by business analysts and decision-makers. This means that users can easily and quickly access the information they need to make informed decisions. A data warehouse is a crucial tool for organizations that need to manage large volumes of data. The tool helps organizations to efficiently consolidate data from various sources into a central location, which is then used to guide decision-making activities within the organization.
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The Montreal Protocol is an international treaty which either banned or phased out what types of air-conditioning refrigerants? Choose two:
A. HCFCs
B. HFCs
C. Ammonia
D. CO2
E. CFCs
Answers
The Montreal Protocol is an international treaty which banned or phased out CFCs and HCFCs. Option B and E are correct.
The Montreal Protocol is an international treaty that was signed in 1987. It aims to protect the ozone layer from further depletion. This treaty banned or phased out the production and consumption of ozone-depleting substances such as CFCs and HCFCs. These substances were commonly used in refrigeration and air-conditioning systems as well as in aerosol cans. The phase-out of these substances has led to the development of alternative refrigerants that are less harmful to the ozone layer, such as hydrofluorocarbons (HFCs). The treaty has been successful in achieving its goals, and the ozone layer is slowly recovering.
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7.5 Code Practice I need help
Answers
Answer:
ok hold on ok
Explanation: ok