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3 years ago

Math question. Photo attached

Mathematics

1 answer:

Lady bird [3.3K]3 years ago

8 0

Answer:

2x+7

Step-by-step explanation:

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Whoever answers this correctly gets brainliest

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Answer:

Its oval and yes........

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2 years ago

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A line passes through the point (2, -9) and has a slope of -9. Write an equation in point-slope form for this line.

Natali [406]

Answer:

$y+9 = - 9x +18$

Step-by-step explanation:

Line is passing through the point $(2,\: - 9) =(x_1,\:y_1)$ and has slope (m) = - 9

General equation of line in point slope form is given as:

$y-y_1 = m(x-x_1)$

Therefore

$y-(-9) = - 9(x-2)$

$y+9 = - 9x +18$

This is the required equation of line in point slope form.

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2 years ago

If the area of a square field is 39.69 sq.m, find the length of one side.<br><br> plz it urgent

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Step-by-step explanation:

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2 years ago

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9. Order the angles of the triangle from smallest to largest

12345 [234]

Answer:

It is b. ACB

Step-by-step explanation:

If draw a triangle, you would give the longest side to BC, because their angles equal 10

And you would give AC the shortest side of the triagle because their angles equal 7

And AB the last side because it is in between the other sides

Since AC have the smallest angle, they would have the smaller numbers

then that leaves B as the biggist number

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2 years ago

A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to construct a 98% confidence inter

frosja888 [35]

Answer:

The minimum sample size required to create the specified confidence interval is 1024.

Step-by-step explanation:

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

$\alpha = \frac{1-0.98}{2} = 0.01$

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

So it is z with a pvalue of $1-0.01 = 0.99$ , so $z = 2.327$

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.

What is the minimum sample size required to create the specified confidence interval

This is n when $M = 0.08, \sigma = \sqrt{1.21} = 1.1$ .

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

$0.08 = 2.327*\frac{1.1}{\sqrt{n}}$

$0.08\sqrt{n} = 2.327*1.1$

$\sqrt{n} = \frac{2.327*1.1}{0.08}$

$(\sqrt{n})^{2} = (\frac{2.327*1.1}{0.08})^{2}$

$n = 1024$

The minimum sample size required to create the specified confidence interval is 1024.

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3 years ago