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3 years ago

What is the solution to the system below? X=7

Mathematics

1 answer:

Olegator [25]3 years ago

8 0

Answer:

A)(7,-9)

Step-by-step explanation:

we know x=7

so put it in the equation

y= -2(7)+5

y=-9

we always put the x coordinate first and then the y coordinate so the answer is (7,-9)

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Varvara68 [4.7K]

Answer: They traveled 405 Miles

Step-by-step explanation:

Trust me! The equation is..

5+4(45)

9(45)

405

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3 years ago

URGENT I NEED HELP!!!!!!!!!!!!!!!!!!!!

Nataliya [291]

Answer:

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Step-by-step explanation:

66/6=11

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3 years ago

The situation is as follows: Smart phones have changed the world and how we spend our time. A group of researchers at BYU want t

Scilla [17]

Answer:

The 96% confidence interval estimate for the mean daily number of minutes that BYU students spend on their phones in fall 2019 is between 306.65 minutes and 317.35 minutes.

Step-by-step explanation:

Confidence interval normal

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.96}{2} = 0.02$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.02 = 0.98$ , so Z = 2.054.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 2.054\frac{54}{\sqrt{430}} = 5.35$

The lower end of the interval is the sample mean subtracted by M. So it is 312 - 5.35 = 306.65 minutes

The upper end of the interval is the sample mean added to M. So it is 312 + 5.35 = 317.35 minutes

The 96% confidence interval estimate for the mean daily number of minutes that BYU students spend on their phones in fall 2019 is between 306.65 minutes and 317.35 minutes.

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2 years ago

There are 6 muffins in a package.How many packages will be needed to feed 48 people if each person has 2 muffins?

Paladinen [302]

16 packages would be needed

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3 years ago

Read 2 more answers

Please help! Will give brainliest. 15 points

Leokris [45]

Answer:

See Explanation

Step-by-step explanation:

$In\: \triangle ABD \: \&\: \triangle ACB\\\angle BAD \cong \angle CAB... (common \: \angle 's) \\\angle ABD \cong \angle ACB... (each\: 45\degree) \\\therefore \triangle ABD \: \sim\: \triangle ACB... (By\: AA\: postulate) \\$

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3 years ago