7-th grade math question will give brainlist thingy

Answer:

B, C, E

Step-by-step explanation:

Elena’s aunt pays her $1 for each call she makes to let people know about her aunt’s new business. The table shows how much money Diego receives for washing windows for his neighbors.

Select all the statements about the situation that are true.

A. Elena makes more money for making 10 calls than Diego makes for washing 10 windows.

Elena:

$1 = 1 call

$10 = 10 calls

Diego:

27 windows = $30

10 windows = $x

Cross product

27*x = 30*10

27x = 300

x = 300/27

x = $11.11

Statement A not true

B. Diego makes more money for washing each window than Elena makes for making each call.

Diego:

10 windows = $11.11

Each window = $11.11/10

= $1.11

Statement B is true

C. Elena makes the same amount of money for 20 calls as Diego makes for 18 windows

Elena:

20 calls = $20

Diego:

18 windows = 18 × $1.11

= $19.98

Approximately $20 to the nearest whole dollar

Statement C is true

D. Diego needs to wash 35 windows to make as much money as Elena makes for 40 calls.

Diego

35 × $1.11 = $38.85

Approximately $39

Elena:

40 calls = $40

Statement D is not true

E. The equation y = x, where y is the number of dollars and x is the number of calls, represents Elena’s situation.

Statement E is true

Answer:

18 Kg

Step-by-step explanation:

We can use algebra to solve for the mass, m, given the delivery price, $70.

Starting with the formula:

price ($) = 7 + 3.5m

We can substitute $70 for price ($) and solve for m:

$70 = 7 + 3.5m

Subtracting 7 from both sides:

$63 = 3.5m

Dividing both sides by 3.5:

m = 18

Therefore, the mass of the parcel is 18 kg.

Answer:

Step-by-step explanation:

a c d are the answer

The value of x if given expression as (x-1)(2-x)<0 will be 1 and 2.

The solution of an equation refers usually to the values of the variables involved in that equation which if substituted in place of those variable would give a true mathematical statement.

We have been given an expression as  (x-1)(2-x)<0, then the value of x can be calculated as;

(x-1)(2-x) = 0

Therefore, Using the zero product property we get;

(x-1) = 0

x = 1

Similarly,

(2-x) = 0

2 = x

Therefore, the value of x if given expression as (x-1)(2-x)<0 will be 1 and 2.

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Answer:

8/12

Step-by-step explanation:

Answer:

12x^2−23x−17x^3+8

Step-by-step explanation:

Answer:

D

Step-by-step explanation:

(x,y)

so,it will change (-y,x)

A' (5,5) ,B'(5, 1) ,C'(2,1), D'(1,5).

Answer:

Option D

13

Step-by-step explanation:

|–5 – 8|

= l-13l

= 13 (Ans)

Null Hypothesis (H₀): The mean weight of the flounder is less than or equal to grams.

Alternate Hypothesis (H₁): The mean weight of the flounder is greater than grams.

In this scenario, the scientists want to perform a hypothesis test to determine the strength of evidence regarding the mean weight of a certain species of flounder being greater than a certain value (let's call it "grams").

The appropriate null and alternative hypotheses can be stated as follows:

Null Hypothesis (H₀): The mean weight of the flounder is equal to or less than grams.

Alternate Hypothesis (H₁): The mean weight of the flounder is greater than grams.

In symbol form:

H₀: μ ≤ grams

H₁: μ > grams

The null hypothesis (H₀) represents the assumption that there is no significant difference between the mean weight of the flounder and the specified value (grams). The alternative hypothesis (H₁) suggests that there is evidence to support that the mean weight of the flounder is greater than grams.

During the hypothesis testing process, the scientists will collect a sample of flounder and perform statistical calculations to determine whether the evidence supports rejecting the null hypothesis in favor of the alternative hypothesis.

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To find the probability for no accidents use the formula P(no accidents) = (1-p)^n, To find the probability that there will be 4 or more accidents  use the formula P(4 or more accidents) = 1 - P(0, 1, 2, 3 accidents), and  at least one accident during the month, t - use the formula P(4 or more accidents) = 1 - P(0, 1, 2, 3 accidents).

a. To find the probability that there will be no accidents during the month at the factory, use the formula P(no accidents) = (1-p)^n, where p is the probability of an accident occurring and n is the number of trials (in this case, the number of days in the month).

b. To find the probability that there will be 4 or more accidents during the month at the factory, use the formula P(4 or more accidents) = 1 - P(0, 1, 2, 3 accidents), where P(0, 1, 2, 3 accidents) is the probability of 0, 1, 2, or 3 accidents occurring during the month.

c. Given that the factory had at least one accident during the month, the probability that the factory had 4 or more accidents during the month is the same as in part b - use the formula P(4 or more accidents) = 1 - P(0, 1, 2, 3 accidents).

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The region of intersection of the line x+y = 1 and the circle x2 + y2 = 4 with x ≥ 0 is an arc of the circle. In polar coordinates, this region is described by the inequalities:

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There are total of 152 students in 5th grade, then the number of pencils altogether will be equal to 2,736 pencils.

The four basic operations of arithmetic can be used to add, subtract, multiply, or divide two or even more quantities.

They cover topics like the study of integers and the order of operations, which are relevant to all other areas of mathematics including algebra, data processing, and geometry.

As per the given information in the question,

Total number of students in 5th grade = 152

Amount of pencil each student have = 18

Then, the total number of pencils altogether,

= 152 × 18

= 2,736 pencils.

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Answer:

16

Step-by-step explanation:

because it's g of 7 use the third equation.

(7+1)(7-5) = 8x2 = 16

Answer:

apply distance formula

\( \sqrt{ {(5 - 2)}^{2} + {(1 - 5)}^{2} } \)

u get

\( \sqrt{9 + 16} \)

which is

\( \sqrt{25} \)

which is 5

brainlist pls

Answer:

287.7

28.77

2.877

Step-by-step explanation:

10^2 = 100

10^3 = 1000

10^4 = 10,000

Answer:

-385y

Step-by-step explanation:

This expression cannot be factored with rational numbers, so -385y is your answer.

The number of additional gifts Jeff can buy with the remaining cost is 1.

Arithmetic operators are four basic mathematical operations in which summation, subtraction, division, and multiplication involve.,

As per the given,

Total cost = $15 + $20 = $35

Total spent = $50

Remaining = $50 - $35 = $15

Since one gift cost $10

Thus, 15/10 = 1.5 since the number of gifts will be the whole number so it will be round to bottom 1 gift.

Hence "With the money still available, Jeff can purchase 1 more present".

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Answer:

10 times 20 would be 200 divided by 2 since its a triangle which is 100

now muttiple 100 by 20 to get 2000

Your Welcome

plz brainlest

Answer:

Hi :) the answer would be 2000

Step-by-step explanation:

All you have to do is multiply all of the sides together and divide by 2. I hope this helped! Have a good day♡

Each of the individual data items in a "structure" or single unit is an entity by itself that is referred to as a "member" or "field."

In programming or computer science, a "structure" is a data type that allows combining different data items of different types into a single unit. Each of these individual data items within the structure is called a "member" or "field." Each member represents a distinct piece of information within the structure and can have its own data type and value. The members of a structure can be accessed and manipulated individually, allowing for organized and efficient handling of related data.

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Answer: €18.22

Step-by-step explanation:

Since £3 is €4, therefore £1 = €4/3 = €1.33. Since we've gotten the value of £1 to €, then we can then calculate the value of £13.70. This will be

= 13.70 × €1.33

= €18.221

= €18.22 to 2 decimal places

Therefore, the correct answer is €18.22.

6,000,000,000.

6,410,900,063 is rounded off to nearest billion.

Answer:

D 35

Step-by-step explanation:

Just added them together

Step-by-step explanation:

A is the answer bsbdbxbxb

Therefore, the expression \(t^{(-3/4)}\) in rational form is:

\(B. 1/^4 \sqrt {t^3}\)

What is the exponential function?

An exponential function is a mathematical function of the form:

f(x) = aˣ

where "a" is a constant called the base, and "x" is a variable. Exponential functions can be defined for any base "a", but the most common base is the mathematical constant "e" (approximately 2.71828), known as the natural exponential function.

To write the expression \(t^{(-3/4)}\) in rational form, we need to eliminate the negative exponent.

Recall that a negative exponent can be rewritten as the reciprocal of the positive exponent. In this case,  \(t^{(-3/4)}\) can be written as 1/ \(t^{(-3/4)}\).

Therefore, the expression \(t^{(-3/4)}\)in rational form is:

\(B. 1/^4 \sqrt {t^3}\)

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The top of the ladder touches a height of 8 feet on the wall. To determine how high on the wall the top of the ladder touches, we can use the Pythagorean theorem.

In this case, the ladder forms the hypotenuse of a right triangle, and the base of the wall and the height on the wall form the other two sides.

Let's denote the height on the wall as 'h'. According to the problem, one end of the ladder is 6 feet from the base of the wall, so the base of the triangle is 6 feet.

We can set up the equation using the Pythagorean theorem:

\((6)^2 + (h)^2 = (10)^2\)

Simplifying the equation:

36 + \(h^2\) = 100

\(h^2\) = 100 - 36

\(h^2\)= 64

Taking the square root of both sides:

h = √64

h = 8

Therefore, the top of the ladder touches a height of 8 feet on the wall.

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Answer:

so c = 2

Step-by-step explanation:

38-2c=12c+4+3c

38-2c=15c+4

34=17c

2=c

The final dilution in the multiple dilution series can be calculated by multiplying the individual dilution factors. In this case, the dilution factors are 1/4, 1/2, 1/5, and 1/10. To find the final dilution, we multiply these factors:

1/4 * 1/2 * 1/5 * 1/10 = 1/400

Therefore, the final dilution is 1/400.

The dilution factor represents the ratio of the final volume to the initial volume. In this case, since the sample was diluted 1/4, 1/2, 1/5, and 1/10 in successive steps, the dilution factor would be the product of these individual dilutions:

1/4 * 1/2 * 1/5 * 1/10 = 1/400

Hence, the dilution factor for this multiple dilution series is 1/400.

If the original concentration of the sample was 100, and the dilution factor for tube 3 is 1/5, we can calculate the concentration in tube 3 by multiplying the original concentration by the reciprocal of the dilution factor:

Concentration in tube 3 = 100 * (1 / 1/5) = 100 * 5 = 500

Therefore, the concentration in tube 3 would be 500 if the original concentration was 100.

To find the dilution factor for tube 2, we need to consider the dilutions performed up to that point. As per the given dilution series, tube 2 is diluted 1/4 and tube 3 is diluted 1/5. To calculate the overall dilution factor for tube 2, we multiply these two dilution factors:

1/4 * 1/5 = 1/20

Hence, the dilution factor for tube 2 is 1/20.

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Answer:

Zero

Step-by-step explanation:

it is to correct answer because I did this before and one of my classes also subscribe to my channel bye

For a one-tailed test with a 0.05 level of significance, the critical z statistic is 1.645, but the critical t statistic is 1.96. The statement is false.

The statement is incorrect. For a one-tailed test with a 0.05 level of significance, the critical z statistic is indeed 1.645. However, the critical t statistic value depends on the degrees of freedom (df), which is not provided in the statement. The 1.96 value mentioned is actually the critical z statistic for a two-tailed test with a 0.05 level of significance.

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The correct answer is C) intensively use natural resources. This is because Chile's comparative advantage lies in its abundant natural resources, and it should therefore focus on producing and exporting goods that make intensive use of those resources.

According to the Heckscher-Ohlin Theorem, countries will tend to specialize in and export goods that make intensive use of their abundant factors of production and import goods that make intensive use of their scarce factors of production. In this case, Brazil is capital abundant and Chile is natural resource abundant. Timber is natural resource intensive, meaning that it requires a lot of natural resources to produce, while computers are capital intensive, meaning that they require a lot of capital to produce.

Therefore, according to the Heckscher-Ohlin Theorem, Chile should export goods that make intensive use of its abundant factor of production, which is natural resources. This means that Chile should specialize in producing and exporting natural resource-intensive goods such as timber, while Brazil should specialize in producing and exporting capital-intensive goods such as computers.

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