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3 years ago

XA

Mathematics

2 answers:

Ipatiy [6.2K]3 years ago

8 0

Answer

D is the correct answer.

Reason

it is so because rectangle has adjacent perpendicular parallel sides with opposite sides equal

sveticcg [70]3 years ago

3 0

The answer is C. No, the adjacent sides are not perpendicular.

<h2>Hope ths helps</h2><h2></h2><h2>From Cambridge</h2>

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4770 people living in the region on average

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3 years ago

Melissa is 29 meters below the surface. After swimming 12 minutes she rises upward 15 meters. What is her final depth?

pav-90 [236]

Answer:

The final depth of Melissa is 14 meters below the surface

Step-by-step explanation:

In this kind of problems, involving directions, etc, usually one position is the positive direction and the other position is the negative direction.

In our problem, we suppose that the surface is the positivo zero, above the surface is the positive position(positive depth) and below the surface is the negative directions(negative depth).

The problem states that Melissa is 29 meters below the surface. So, her initial position is 29 meters in the negative direction, so it is equal to -29.

Then, the problem states that Melissa rises upward 15 meters. Upward is the positive direction, so she moved to the positive direction. It means that we are going to do -29+15 = -14 meters.

It means that the final depth of Melissa is 14 meters below the surface

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3 years ago

Write an inequality to express the relationship between -2 and -5?

harkovskaia [24]

$\qquad\qquad\huge\underline{{\sf Answer}}$

The inequality that express the relationship between -2 and -5 is : " greater than " or " > "

$\qquad \tt \dashrightarrow \: - 2 > - 5$

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3 years ago

There is a pair of shoes for $126 but you have a 20% gift card and tax is .0825% but h only have $130

pantera1 [17]

Answer:

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Step-by-step explanation:

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4 years ago

The data below are the final exam scores of 10 randomly selected statistics students and the number of hours they studied for th

stiv31 [10]

Answer:

$r=\frac{10(6811)-(92)(723)}{\sqrt{[10(878) -(92)^2][10(53395) -(723)^2]}}=0.8465$

So then the correlation coefficient would be r =0.8465

And the best options would be:

(D) 0.847

Step-by-step explanation:

Previous concepts

The correlation coefficient is a "statistical measure that calculates the strength of the relationship between the relative movements of two variables". It's denoted by r and its always between -1 and 1.

And in order to calculate the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

Solution to the problem

Data given:

X: 8 10 7 13 7 9 9 10 11 8

Y: 60 75 55 83 61 73 80 85 85 66

For our case we have this:

n=10 $\sum x = 92, \sum y = 723, \sum xy = 6811, \sum x^2 =878, \sum y^2 =53395$

And if we replace into the formula we got:

$r=\frac{10(6811)-(92)(723)}{\sqrt{[10(878) -(92)^2][10(53395) -(723)^2]}}=0.8465$

So then the correlation coefficient would be r =0.8465

And the best options would be:

(D) 0.847

8 0

3 years ago

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