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3 years ago

Solve.

Mathematics

2 answers:

Sophie [7]3 years ago

5 0

Answer: He swam about 900 meters on those 3 weeks.

Paha777 [63]3 years ago

4 0

Answer:

Step-by-step explanation:if three weeks is equal to 21 than 0.86 times 21 equal 18.06 i believe

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You are trying to decide between two different gyms. The cost for GloboGym includes a monthly fee of $24.00 plus $.50 per visit.

IRINA_888 [86]

Answer:

i dot kniw

Step-by-step explanation:

5 0

3 years ago

The product of a number and -6 is -600

rewona [7]

Answer:

n= 100

Step-by-step explanation:

Product is the answer when two numbers are multiplied together. So, n×-6=600.

100×-6=-600

3 0

4 years ago

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

bulgar [2K]

We need to find out how many adults must the brand manager survey in order to be 90% confident that his estimate is within five percentage points of the true population percentage.

From the given data we know that our confidence level is 90%. From Standard Normal Table we know that the critical level at 90% confidence level is 1.645. In other words, $Z_{Critical}=1.645$ .

We also know that E=5% or E=0.05

Also, since, $\hat{p}$ is not given, we will assume that $\hat{p}$ =0.5. This is because, the formula that we use will have $\hat{p}(1-\hat{p})$ in the expression and that will be maximum only when $\hat{p}$ =0.5. (For any other value of $\hat{p}$ , we will get a value less than 0.25. For example if, $\hat{p}$ is 0.4, then $1-\hat{p}=0.6$ and thus, $\hat{p}(1-\hat{p})=0.24$ .).

We will now use the formula

$n=(\frac{Z_{Critical}}{E})^2\hat{p}(1-\hat{p})$

We will now substitute all the data that we have and we will get

$n=(\frac{1.645}{0.05})^2\times0.5(1-0.5)$

$n=(32.9)^2\times0.25$

$n=270.6025$

which can approximated to n=271.

So, the brand manager needs a sample size of 271

3 0

3 years ago

What is the union sets M= (1,7,10,11,15) and N=(5,15)?

katen-ka-za [31]

Answer: <em>(1,5,7,10,11,15)</em>

To get the union of two sets of numbers, all you do is combine the numbers from least to greatest. If a number repeats in the 2 sets, you only put it once.

7 0

4 years ago

Read 2 more answers

Ryan runs 8 miles in 74 minutes. How many minutes does he run per mile?

blsea [12.9K]

I think it takes him about 9 minutes and 25 seconds to run a mile

4 0

3 years ago