Given:
Volume consumed by Mrs. Santos = 8.976 m³
To find:
the cost of 8.976 m³ if 1 m³ cost Php 45.00
let the cost of 8.976 m³ = y
1 m³ = Php 45
8.976 m³ = y
cross multiply:
\(\begin{gathered} 1(y)\text{ = 45\lparen8.976\rparen} \\ \\ y\text{ = 403.92} \\ \\ The\text{ cost of 8.976m}^3\text{ is 403.92 Php} \end{gathered}\)Airline travelers should be ready to be more flexible as airlines once again cancel thousands of flights this summer. The Coalition for Airline Passengers Rights, Health, and Safety averages 400 calls a day to help stranded travelers deal with airlines (seattlepi.com, July 10, 2008). Suppose the hotline is staffed for 16 hours a day. a. Calculate the average number of calls in a one-hour interval; 30-minute interval; 15-minute interval. (Round your answers to 2 decimal places.) Interval Average Number of Calls 60-minute 30-minute 15-minute b. What is the probability of exactly 6 calls in a 15-minute interval? (Round your intermediate calculations and final answer to 4 decimal places.) Probability c. What is the probability of no calls in a 15-minute interval? (Round your intermediate calculations and final answer to 4 decimal places.) Probability d. What is the probability of at least two calls in a 15-minute interval? (Round your intermediate calculations and final answer to 4 decimal places.) Probability
The Coalition for Airline Passengers Rights, Health, and Safety averages 400 calls a day to help stranded travelers deal with airlines. The hotline is staffed for 16 hours a day.
To calculate the average number of calls in different time intervals and the probability of different events related to these calls.
Part 1:
a. 60-minute interval average number of calls: 400/16 = 25 calls
30-minute interval average number of calls: 25/2 = 12.5 calls
15-minute interval average number of calls: 12.5/2 = 6.25 calls
Part 2:
b. To find the probability of exactly 6 calls in a 15-minute interval, we can use the Poisson distribution formula. Let's assume that the average number of calls in a 15-minute interval is 6.25. Then, the probability of exactly 6 calls in a 15-minute interval is:
P(6 calls) = (e^-6.25)*(6.25^6)/6! = 0.0686
c. To find the probability of no calls in a 15-minute interval, we can use the Poisson distribution formula. Let's assume that the average number of calls in a 15-minute interval is 6.25. Then, the probability of no calls in a 15-minute interval is:
P(0 calls) = e^-6.25 = 0.0047
d. To find the probability of at least two calls in a 15-minute interval, we can use the cumulative distribution function of the Poisson distribution. Let's assume that the average number of calls in a 15-minute interval is 6.25. Then, the probability of at least two calls in a 15-minute interval is:
P(X >= 2) = 1 - P(0 calls) - P(1 call) = 1 - 0.0047 - (e^-6.25)*(6.25^1)/1! = 0.9906
Thus, the average number of calls in a 60-minute interval is 25, in a 30-minute interval is 12.5, and in a 15-minute interval is 6.25. The probability of exactly 6 calls in a 15-minute interval is 0.0686, the probability of no calls in a 15-minute interval is 0.0047, and the probability of at least two calls in a 15-minute interval is 0.9906.
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A company manufactures a brand of lightbulb with a lifetime in months that is normally distributed with mean 3 and variance 1. A consumer buys a number of these bulbs with the intention of replacing them successively as they burn out. The light bulbs have independent lifetimes. What is the smallest number of bulbs to be purchased so that the succession of bulbs produces light for at least 40 months with probability at least 0.9772
Answer:
The smallest number of bulbs to be purchased so that the succession of bulbs produces light for at least 40 months with probability at least 0.9772 is 16.
Step-by-step explanation:
Solving a quadratic equation:
Given a second order polynomial expressed by the following equation:
\(ax^{2} + bx + c, a\neq0\).
This polynomial has roots \(x_{1}, x_{2}\) such that \(ax^{2} + bx + c = a(x - x_{1})*(x - x_{2})\), given by the following formulas:
\(x_{1} = \frac{-b + \sqrt{\Delta}}{2*a}\)
\(x_{2} = \frac{-b - \sqrt{\Delta}}{2*a}\)
\(\Delta = b^{2} - 4ac\)
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean \(\mu\) and standard deviation \(\sigma\), the zscore of a measure X is given by:
\(Z = \frac{X - \mu}{\sigma}\)
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
n values from a normal distribution:
The mean is \(\mu n\) and the standard deviation is \(s = \sigma\sqrt{n}\)
A company manufactures a brand of lightbulb with a lifetime in months that is normally distributed with mean 3 and variance 1.
This means that \(\mu = 3, \sigma = \sqrt{1} = 1\)
For n bulbs:
The distribution for the sum of n bulds has \(\mu = 3n, \sigma = \sqrt{n}\)
What is the smallest number of bulbs to be purchased so that the succession of bulbs produces light for at least 40 months with probability at least 0.9772?
We want that: \(S_{n} \geq 40 = 0.9772\).
This means that when X = 40, Z has a pvalue of 1 - 0.9772 = 0.0228, that is, when \(X = 40, Z = -2\). So
\(Z = \frac{X - \mu}{\sigma}\)
\(-2 = \frac{40 - 3n}{\sqrt{n}}\)
\(-2\sqrt{n} = 40 - 3n\)
\(3n - 2\sqrt{n} - 40 = 0\)
Using \(y = \sqrt{n}\)
\(3y^2 - 2y - 40 = 0\)
Which is a quadratic equation with \(a = 3, b = -2, y = -40\)
\(\Delta = b^{2} - 4ac = (-2)^2 - 4(3)(-40) = 484\)
\(y_{1} = \frac{-(-2) + \sqrt{484}}{2*3} = 4\)
\(y_{2} = \frac{-(-2) - \sqrt{484}}{2*3} = -...\)
Since y and n have both to be positive:
\(y = \sqrt{n}\)
\(\sqrt{n} = 4\)
\((\sqrt{n})^2 = 4^2\)
\(n = 16\)
The smallest number of bulbs to be purchased so that the succession of bulbs produces light for at least 40 months with probability at least 0.9772 is 16.
Classify the polynomial by its degree.x2+ 2x3-4
Answer
The polynomial is a 3rd degree polynomial
Explanation
Given the following expression
x^2 + 2x^3 - 4
Step 1: Re- arrange the expression
2x^3 + x^2 - 4
The highest power of x in the expression is 3
The highest degree is 3
Therefore, the polynomial is 3rd degree
18 inches = ___ centimeters
A 36.95 .B 45.72 .C 26.32 .D 91.8
Answer:
b
Step-by-step explanation:
45.72
30. When the polynomial f(x) = (p-1)x³ + px² + qx +r, where p, q and r are constants, is divided by (x + 2) and (x - 1), the remainders are - 5 and 4 respectively. If (x + 1) is a factor of f(x), find the values of p, q and r. Hence, factorize f(x) completely.
Answer:
Step-by-step explanation:
Using the remainder theorem we get:
\(f(-2)=-5\), \(f(1)=4\), and \(f(-1)=0\)
So we get
\(f(-2)=(-8)(p-1)+4p-2q+r=-5\)
\(-8p+8+4p-2q+r=-5\)
\(-4p-2q+r=-13\) \((a)\)
\(f(1)=(p-1)+p+q+r=4\)
\(2p+q+r=5\) \((b)\)
\(f(-1)=-(p-1)+p-q+r=0\)
\(-q+r=-1\) \((c)\)
We need to solve (a), (b) and (c) simultaneously to find p,q, and r.
from \((c)\) \(r=q-1\). Sub this into (a) and (b):
\(-4p-2q+(q-1)=-13 \rightarrow -4p-q=-12\) \((d)\)
\(2p+q+(q-1)=5 \rightarrow q=3-p\) \((e)\)
Sub (e) into (d) we get
\(-4p-(3-p)=-12 \rightarrow p=3\)
Sub \(p=3\) into \((e) \rightarrow q=0\)
Sub \(p=3,q=0\) into \((c) \rightarrow r=-1\)
SOLUTION: \(p=3,q=0,r=-1\)
So \(f(x)=2x^3+3x^2-1\)
by dividing (x+1) into f(x) we get (I am not showing working for this division)
\(f(x)=(x+1)(2x^2+x-1)\)
\(\rightarrow f(x)=(x+1)(2x-1)(x+1)\)
A student is painting a brick for his teacher to use as a doorstop in the classroom. He is only painting the front of the brick. The vertices of the face are (−4, 2), (−4, −11), (4, 2), and (4, −11). What is the area, in square inches, of the painted face of the brick?
Using the given coordinates we know that the area of the surface on which a student paints is 144 in².
What are coordinates?A coordinate system in geometry is a method for determining the precise location of points or other geometrical objects on a manifold, such as Euclidean space, using one or more numbers, or coordinates.
Coordinates are a pair of integers (Cartesian coordinates), or sporadically a letter and a number, that identify a certain place on a grid, also referred to as a coordinate plane.
The x-axis (horizontal) and y-axis are the two axes that make up a coordinate plane (vertical).
A square's area can be calculated using:
A = L²
We only need to determine the length of one side because a square's sides are all the same length.
The distance between the two vertices in this square, which serves as the side length, may be calculated as:
L = √[(x₂ - x₁)² + (y₂ - y₁)²]
But, since it is a square, we can use coordinate subtraction to obtain the side length, which is obtained by utilizing the first three coordinates:
Horizontal length = (6 + 6) = 12
Then;
Area = L² = 12² = 144 in²
Therefore, using the given coordinates we know that the area of the surface on which a student paints is 144 in².
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Which scale factor was used to create triangle SRT?
Answer:
1.6
Step-by-step explanation:
5 times 1.6 is 8.
Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.
Match each graph with the correct cosine function based on its period.
Graph shows a sinusoidal function plotted on a coordinate plane. A curve enters quadrant 2 and it goes through (0, 1), (1.5, 0), (3, minus 1), (5, 0), (6.5, 1), (7.5, 0), It follows the same pattern.
Graph shows a sinusoidal function plotted on a coordinate plane. A curve enters quadrant 2 and it goes through (0, 1), (3, 0), (6, minus 1), (9.5, 0). It follows the same pattern.
Graph shows a sinusoidal function plotted on a coordinate plane. A curve enters quadrant 2 and it goes through (0, 1), (0.5, 0), (1, minus 1), (1.5, 1), (2, 0), (2.5, minus 1), (3, 0). It follows the same pattern.
Graph shows a sinusoidal function plotted on a coordinate plane. A curve enters quadrant 2 at (minus 1, 0) and goes through (0, 1), (1, 0), (3, 1), (4, 0), and (4.5, minus 1) and curve follows the same pattern on X-axis.
Graph shows a sinusoidal function plotted on a coordinate plane. A curve enters quadrant 2 and it goes through (0, 1), (6, 0), and (12, minus 1). It follows the same pattern.
y=cos x/2 arrowRight
y=cos x arrowRight
y=cos x/4 arrowRight
y=cos x/4arrowRight
The correct answer is Graph 1: y = cos(x/4)Graph 2: y = cos(x/2)
Based on the given descriptions of the graphs and the patterns they follow, the correct pairs are:
Graph 1: y = cos(x/4) ⟶ This graph has a period of 8 units and matches the pattern described.Graph 2: y = cos(x/2) ⟶ This graph has a period of 4 units and matches the pattern described.
Graph 3: y = cos(x) ⟶ This graph has a period of 2π (or approximately 6.28 units) and matches the pattern described.
Graph 4: (Not used)
Graph 5: (Not used)
Please note that without visual representation, it's difficult to provide a definitive answer. The pairs are based on the descriptions provided and may vary depending on the actual shapes of the graphs.
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Hannah has to make 168 gallons of punch for a big party. The punch is made of soda and fruit drink. The cost of the soda is $1.57 per gallon and the cost of the fruit drink is $2.41 per gallon. Hannah's budget requires that the punch cost $1.66 per gallon. How many gallons of soda and how many gallons of fruit drink does she need?
Gallons of soda =
Gallons of fruit punch =
The number of gallons of fruit drink is 118 gallons and the number of gallons of soda is 150 gallons.
How much fruit drink and soda does he need?The system of equations that represents the question is:
f + s = 168 equation 1
2.41f + 1.57s = (1.66 x 168)
2.41f + 1.57s = 278.88 equation 2
Where:
f = number of gallons of fruit drink s = number of gallons of sodaThe elimination method would be used to determine the required values
Multiply equation 1 by 2.41
2.41f + 2.41s = 404.88 equation 3
Subtract equation 2 from equation 3
126 = 0.84s
s = 126 / 0.84
s = 150
Substitute for s in equation 1
f + 150 = 168
f = 168 - 150
f - 118 gallons
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the ages of six boys are given as 12 years 3 months, 18 years, 13 years 7 months, 17 years 2 months 15 years and 14 years respectively. what is their average age?
Answer:
15 years (180 months)
Step-by-step explanation:
turn it into months first
147
216
163
206
180
168
add them together, then divide by how many there are
1,080/6=180 months
180/12 =15
To help open up a restaurant, Linda borrowed money from a bank.
She took out a personal, amortized loan for $43,500, at an interest rate of 6.75%, with monthly payments for a term of 8 years.
For each part, do not round any intermediate computations and round your final answers to the nearest cent.
If necessary, refer to the list of financial formulas.
(a) Find Linda's monthly payment.
(b) If Linda pays the monthly payment each month for the full term,
find her total amount to repay the loan.
(c) If Linda pays the monthly payment each month for the full term,
find the total amount of interest she will pay.
(a) Linda's monthly payment is approximately $578.80.
(b) If Linda pays the monthly payment each month for the full term, her total amount to repay the loan is approximately $55,660.80.
(c) If Linda pays the monthly payment each month for the full term, the total amount of interest she will pay is approximately $12,160.80.
Let's break down the calculation into the following steps:
(a) Monthly Payment Calculation:
To calculate the monthly payment, we can use the formula:
Monthly Payment = P × (r × (1 + r)ⁿ) / ((1 + r)ⁿ - 1)
Where:
P = Principal amount of the loan
r = Monthly interest rate (annual interest rate / 12)
n = Total number of monthly payments (number of years × 12)
Substituting the given values:
P = $43,500
Annual interest rate = 6.75%
r = 0.0675 / 12
n = 8 years × 12
Let's calculate the monthly payment:
r = 0.0675 / 12
= 0.005625
n = 8 × 12
= 96
Monthly Payment = $43,500 × (0.005625 × (1 + 0.005625)⁹⁶) / ((1 + 0.005625)⁹⁶ - 1)
Using a financial calculator or spreadsheet software, the monthly payment is approximately $578.80.
Total Amount Repaid Calculation:
The total amount repaid is equal to the monthly payment multiplied by the total number of payments (n).
Total Amount Repaid = Monthly Payment × n
Total Amount Repaid = $578.80 × 96
Using a financial calculator or spreadsheet software, the total amount repaid is approximately $55,660.80.
Total Interest Paid Calculation:
The total interest paid can be calculated by subtracting the principal amount (P) from the total amount repaid.
Total Interest Paid = Total Amount Repaid - P
Total Interest Paid = $55,660.80 - $43,500
Using a financial calculator or spreadsheet software, the total interest paid is approximately $12,160.80.
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Step by step answer please, thanks so much! :)
On solving the provided question, we can say that annual percentage yield (APY) in this situation, we need to take into account the effect of compounding. The formula for APY is: \(APY = (1 + APR/n)^{n - 1}\)
What is percentage?A percentage in mathematics is a figure or ratio that is stated as a fraction of 100. The abbreviations "pct.," "pct," and "pc" are also occasionally used. It is frequently denoted using the percent symbol "%," though. The amount of percentages has no dimensions. With a denominator of 100, percentages are basically fractions. To show that a number is a percentage, place a percent symbol (%) next to it. For instance, if you correctly answer 75 out of 100 questions on a test (75/100), you receive a 75%. To compute percentages, divide the amount by the total and multiply the result by 100. The percentage is calculated using the formula (value/total) x 100%.
annual percentage yield (APY) in this situation, we need to take into account the effect of compounding. The formula for APY is:
\(APY = (1 + APR/n)^{n - 1}\)
where APR is the annual percentage rate, n is the number of compounding periods per year.
In this case, the APR is 2.65% and the compounding period is monthly, so n = 12 (number of months in a year). Plugging these values into the formula, we get:
\(APY = (1 + 0.0265/12)^12 - 1\\APY = 0.02692 or 2.692%\)
Therefore, the annual percentage yield (APY) for this bank account is 2.692%.
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Anyone willing to answer this question
Answer:
C.
Step-by-step explanation:
To get a perpendicular line, the slope will be the opposite of what you currently have. You have a slope of 2, so the opposite reciprocal slope will be -1/2. Then, you use the equation y = mx+b and substitute (2,5) for the y and the x (2 for the x and 5 for the y). This is to solve for b. Then, you have your equation! Hope this helped.
Extra Credit #4
What are the next two numbers in this pattern?
431
141311
1114111321
311431131211
Answer:
The next two numbers following:
431
141311
1114111321
311431131211
are:
132114132113111221
AND
11131221141113122113312211
Step-by-step explanation:
I shall explain the pattern below:
431 (just the digits 4, 3, and 1)
141311 (one 4 becomes 14, one 3 becomes 13, one 1 becomes 11 -> looking at each digit of the previous number, 431)
1114111321 (one 1 becomes 11, one 4 becomes 14, one 1 becomes 11, one three becomes 13, two consecutive 1s becomes 21 -> looking at each digit of the previous number, 141311)
311431131211 (three consecutive 1s becomes 31, one 4 becomes 14, 3 more consecutive 1s becomes 31, one 3 becomes 13, one 2 becomes 12, and one 1 becomes 11 -> looking at each digit of the previous number, 1114111321)
NEXT TWO NUMBERS:
one 3 (13), two consecutive 1s (21), one 4 (14), one 3 (13), two consecutive 1s (21), one 3 (13), one 1 (11), one 2 (12), two consecutive 1s (21)
that makes: 132114132113111221
one 1 (11), one 3 (13), one 2 (12), two consecutive 1s (21), one 4 (14), one 1 (11), one 3 (13), one 2 (12), two consecutive 1s (21), one 3 (13), three consecutive 1s (31), two consecutive 2s (22), one 1 (11)
that makes: 11131221141113122113312211
The rule is that the next number is essentially the previous number with the number of times each digit appears consecutively before each digit of the previous number. I know that sounds convoluted. Hopefully it makes enough sense. Let me know if I should explain more fully.
How much would you need to deposit in an account now in order to have $2000 in the account in 5 years? Assume the account earns 5% interest compounded monthly.
I need to deposit $1558.41 to have $2000 in the account in 5 years.
What is compound interest?
The interest charged on a debt or deposit is known as compound interest. It is the idea that we use the most regularly. Compound interest is calculated for a sum based on both the principal and cumulative interest.
∴ Compound interest = P(1 + \(\frac{r}{100*12}\))ⁿ (∵ for monthly interest)
P = Principal
r = rate of interest per month
n = number of months
Given:
r = 5% per month
n = 5 years = 5*12 = 60 months
CI = P (1+5/(12 * 100))⁶⁰
2000 = P(1.0041)⁶⁰
2000 = P(1.2834)
P = 1558.41
Therefore, the amount required to deposit is 1558.41 dollars to get 2000 dollars after 5 years with 5 percent interest per month.
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I need help pls help
Answer:
550g
Step-by-step explanation:
total g in 1 kg is 1000
so 1000 - 550 =450
When studying survey results of self-reported mental wellness values the mean was 5 with a standard deviation of 2. Your score was exactly one standard deviation below the mean. What was your score?
Based on the standard deviation, if your score was exactly one standard deviation below the mean then your score was 3.
How to find your score?When a score is said to be one standard deviation below or above the mean, then it means that they are in a range around the mean that is either the standard deviation added to the mean or subtracted from the mean.
The standard deviation of the survey results of self-reported mental wellness was 2. If you scored one standard deviation below the mean then your score was:
= Mean - Standard deviation from mean
= 5 - 2
= 3
In conclusion, your score was 3.
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What is the positive solution to the equation 2x^2+25=73
Answer:
\(x=\sqrt{24}\)
Step-by-step explanation:
2x^2+25=73
Subtract 25 from both sides:
2x^2=48
Divide both sides by 2:
x^2=24
Square both sides:
\(\sqrt{x^{2} } =\sqrt{24}\)
\(x=\sqrt{24}\)
Find the probability of drawing a 10 from a standard deck
of 52 cards,
Answer:
4/52 or 1/13 (simplified)
Step-by-step explanation:
There are 4 "10's" in a pack.
This means you have the chance to pick 4 10's.
So out of 52 cards, you can get 4.
4/52 -> Which can be simplified to 1/13.
This is the probability of getting a 10 (once) in a standard deck of cards.
The probability of drawing a 10 from a standard deck of 52 cards is 1/13.
Number of 10's in a standard deck of 52 cards =4
Total cards =52
What is probability?Probability is the measurement of the possibilities of events.
P(event) =Favorable outcomes/ Total possible outcomes
Here, Favorable outcomes =4
Total possible outcomes =52
P(10) =4/52
P(10) =1/13
So, the probability of drawing a 10 from a standard deck of 52 cards =1/13
Thus, the probability of drawing a 10 from a standard deck of 52 cards is 1/13
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if x and y are positive integers, which of the following cannot be the greatest common divisor of 35x and 20y ?
The greatest common divisor of 35x and 20y is 35x and 20y.
In the given question, if x and y are positive integers, then we have to find which of the following cannot be the greatest common divisor of 35x and 20y.
Since x and y are positive integer so 35x and 20y are also positive integer
Divisor of a positive integer cannot be more than that integer (for example integer 4 doesn't have a divisor more than 4, the largest divisor it has is 4 itself), so greatest common divisor of two positive integers 35x and 20y cannot be more than 35x or 20y.
Hence, the greatest common divisor of 35x and 20y is 35x and 20y.
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Find the area of the rhombus 12 5
what is the solution to the system 3x+2y=-3 and 9x +4y=3
Answer:
x=3, y=-6
Step-by-step explanation:
As you know there are many ways to solve this question! First is Subsitutuion, Second is Elimination, and Third is Graphing!
Let’s begin with our detailed answer:
As you know subsitution is solving for a variable and then it can be used as a variable substitution to figure out x and y.
So in our system of equations:
\(\left \ {3x+2y=-3}} \atop {9x+4y=3}} \right.\)
I will just take one equation and solve for x but it actually dosent matter which variable you subsitutue and solve for.
\(\left \ {3x+2y=-3}} \atop {9x+4y=3}} \right.\)
To eliminate this question we can divide the top part by -3:
\(\left \ {-9x-6y=9}} \atop {9x+4y=3}} \right.\)
Let‘s sum these system of equation and we get: \(y=-6\)
We can now insert y as -6 and solve for x:
\(3x-12=-3\)
\(x=3\)
So, \(x=3, y = -6\)
Answer:
(3, - 6 )
Step-by-step explanation:
3x + 2y = - 3 → (1)
9x + 4y = 3 → (2)
Multiplying (1) by - 3 and adding to (2) will eliminate the x- term
- 9x - 6y = 9 → (3)
Add (2) and (3) term by term to eliminate x
0 - 2y = 12
- 2y = 12 ( divide both sides by - 2 )
y = - 6
Substitute y = - 6 into either of the 2 equations and solve for x
Substituting into (1)
3x + 2(- 6) = - 3
3x - 12 = - 3 ( add 12 to both sides )
3x = 9 ( divide both sides by 3 )
x = 3
solution is (3, - 6 )
Convert as indicate 52 oz to ___ lb __oz
ANSWER
\(\begin{equation*} 3\text{ }lb\text{ }4\text{ }oz \end{equation*}\)EXPLANATION
We want to convert 52 ounces to pounds (and ounces).
To convert from ounces to pounds, we have to multiply the mass in ounces by 0.0625. This implies that 52 oz is:
\(\begin{gathered} 52*0.0625 \\ \Rightarrow3.25\text{ }lb \end{gathered}\)We want to write it in terms of whole numbers, so w have to convert the decimal part of the mass in piounds back to ounces. To do that, multiply by 16. This implies that 0.25 lb is:
\(\begin{gathered} 0.25*16 \\ \Rightarrow4\text{ }oz \end{gathered}\)Therefore, 52 oz is:
\(52\text{ }oz=3\text{ }lb\text{ }4\text{ }oz\)That is the answer.
The radius of the base of a cylinder is expanding at a constant rate of 3 mm/min. If the height of
the cylinder is a constant 20 mm, find the rate at which the VOLUME of the cylinder is changing at the
moment when the radius of the base of the cylinder is 10 mm. Also find the rate at which the SURFACE
AREA of the cylinder is changing at this same moment.
(V = r²h, SA=2лrh+2rr²)
I’m getting 1800pi mm^3/min for volume and 360pi mm^2/min for surface area but I’m not sure if it’s correct
The rate at which the volume of the cylinder is changing is 600 mm^3/min, and the rate at which the surface area is changing is 240π mm^2/min.
To find the rate at which the volume and surface area of the cylinder are changing, we can use the given formulas for volume and surface area and differentiate them with respect to time. Let's calculate the rates at the moment when the radius of the base is 10 mm.
Given:
Radius rate of change: dr/dt = 3 mm/min
Height: h = 20 mm
Radius: r = 10 mm
Volume of the cylinder (V) = \(r^2h\)
Differentiating with respect to time (t), we have:
dV/dt = 2rh(dr/dt) + \(r^2\)(dh/dt)
Since the height of the cylinder is constant, dh/dt = 0.
Substituting the given values:
dV/dt = 2(10)(20)(3) + (10^2)(0)
dV/dt = 600 + 0
dV/dt = 600 mm^3/min
Therefore, the rate at which the volume of the cylinder is changing at the given moment is 600 mm^3/min.
Surface area of the cylinder (SA) = 2πrh + 2π\(r^2\)
Differentiating with respect to time (t), we have:
dSA/dt = 2πr(dh/dt) + 2πh(dr/dt) + 4πr(dr/dt)
Again, since the height of the cylinder is constant, dh/dt = 0.
Substituting the given values:
dSA/dt = 2π(10)(0) + 2π(20)(3) + 4π(10)(3)
dSA/dt = 0 + 120π + 120π
dSA/dt = 240π mm^2/min
Therefore, the rate at which the surface area of the cylinder is changing at the given moment is 240π mm^2/min.
For more such questions on cylinder
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Find the measure of angle x. Round your answer to the nearest hundredth.
Answer:
28.07°
Step-by-step explanation:
use SohCahToa
in this case we use tan^-1 to get the angle x°
tan^-1(8/15)=28.07248694
to the nearest hundredth
=28.07°
4y=2x nonportional or portional
The relationship described by the equation 4y = 2x is proportional.
The relationship in the equation 4y = 2x is proportional. By simplifying the equation, we got that y = (1/2)x, which shows that y is directly proportional to x. In a proportional relationship, the ratio of y to x always remains constant.
In this scenerio, the constant of proportionality is 1/2. As x increases or decreases, y also increases or decreases by half of x.
So, the relationship between y and x in this equation is proportional, indicating that changes in x will result in corresponding proportional changes in y.
To know more about proportional:-
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The question is:-
Is the relationship described by the equation 4y = 2x proportional or non-proportional?
It is assumed that the test results for a class follow a normal distribution with a mean of 78 and a standard deviation of 36. If you know that a student's grade is greater than 72, what is the probability that it is greater than 84
Answer: 0.4337
Step-by-step explanation:
Let X represents the test results for a class that follow a normal distribution .
Given: Mean \(\mu=78\), Standard deviation \(\sigma=36\)
Then, the probability that it is greater than 84 will be
\(P(X>84)=P(\dfrac{X-\mu}{\sigma}>\dfrac{84-78}{36})\\\\=P(Z>0.167)\ \ \ [Z=\dfrac{X-\mu}{\sigma}]\\\\=1-P(Z<0.167)\\\\=1-0.5663=0.4337\ [\text{By p-value table}]\)
Hence, the required probability = 0.4337
For homework, a student had to complete 54 problems total. If she finished 9 problems in
class, what is the ratio of problems she still needs to complete to problems that she's
already finished?
Answer:
10
Step-by-step explanation:
Answer:
45:9
Step-by-step explanation:
Sara left a bin outside in her garden to collect rainwater. She notices that one over eight gallon of water fills two over three of the bin. Write and solve an equation to find the amount of water that will fill the entire bin. Show your work. Explain your answer in words.
Answer:
3/16
Step-by-step explanation:
In order to get the amount of water to fill a bin, we just divide the amount of water by the fraction of the bin it fills. This makes the unit of the resulting answer as gallons/bin or gallons per bin.
Which of the following pairs consists of equivalent fractions? 3/9 and 5/15 ,12/20 and 20/25,5/6 and 6/5,6/12 and3/4
Answer:
\(The\) \(Answer\) \(Is:\) \(\frac{3}{9}\) \(&\)& \(\frac{5}{15}\)
Step-by-step explanation:
Divide by 4 , 2nd fraction Divide by 5:
3/4 ≠ 4/5
5/6 ≠ 6/5 We can already see it.
Divide by 3. . .
2/4 ≠ 3/4
Divide by 3 , 2nd fraction Divide by 5:
1/3 = 1/3 \(Perfect!\)
The answer is, \(\frac{3}{9}\) & \(\frac{5}{15}\)