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2 years ago

If you help me I’ll mark brainliest

Mathematics

1 answer:

Dafna11 [192]2 years ago

5 0

Answer:

1= 2x+74

or,

now,

1+3= being straight angle

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You need 2 3/4 wheelbarrows of sand to make 8 wheelbarrows of concrete. how much sand will you need to make 248 cubic feet of co

horsena [70]

8 ÷ (2 3/4) = 32/11

248 ÷ (32/11) = B. 85 1/4 cubic feet

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2 years ago

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Susie scored 85, 84,and 78 on three of the four math tests. if her average score for the four tests was 86. what was her score o

nata0808 [166]

(85 + 84 + 78 + x) / 4 = 86
(247 + x) / 4 = 86
247 + x = 86 * 4
247 + x = 344
x = 344 - 247
x = 97 <=== her score was 97

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2 years ago

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96=-8k solve <br> Show work

larisa86 [58]

Answer:

$k = -12$

Step-by-step explanation:

<u>Step 1: Divide both sides by -8</u>

<u /> $96 / -8 = -8k / -8$

$-12 = k$

Answer: $k = -12$

3 0

3 years ago

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What is the simplified form of this expression? (8x − 7) + (-2x − 9) − (4x − 3)

Murljashka [212]

Answer:

The answer to your question is: 2x -13

Step-by-step explanation:

Simplified (8x − 7) + (-2x − 9) − (4x − 3)

8x - 7 - 2x - 9 - 4x + 3

Simplified like terms 8x - 2x - 4x - 7 - 9 + 3

2x -13

4 0

3 years ago

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The brand manager for a brand of toothpaste must plan a campaign designed to increase brand recognition. He wants to first deter

VMariaS [17]

Answer:

He must survey 123 adults.

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.

$\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}$

In which

z is the z-score that has a p-value of $1 - \frac{\alpha}{2}$ .

The margin of error is:

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

Assume that a recent survey suggests that about 87% of adults have heard of the brand.

This means that $\pi = 0.87$

90% confidence level

So $\alpha = 0.1$ , z is the value of Z that has a p-value of $1 - \frac{0.1}{2} = 0.95$ , so $Z = 1.645$ .

How many adults must he survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage?

This is n for which M = 0.05. So

$M = z\sqrt{\frac{\pi(1-\pi)}{n}}$

$0.05 = 1.645\sqrt{\frac{0.87*0.13}{n}}$

$0.05\sqrt{n} = 1.645\sqrt{0.87*0.13}$

$\sqrt{n} = \frac{1.645\sqrt{0.87*0.13}}{0.05}$

$(\sqrt{n})^2 = (\frac{1.645\sqrt{0.87*0.13}}{0.05})^2$

$n = 122.4$

Rounding up:

He must survey 123 adults.

6 0

2 years ago