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3 years ago

(-3×-7)+(4x+7) pleasw solve this

2 answers:

8 0

-3x -7 + 4x + 7

= 4x - 3x - 7 + 7

= x - 7 + 7

= x

Or.. if your are doing it this way then it would be

(-3 * -7) + (4 +7)

= 3 * 7 + 4 +7

= 21 + 4 + 7

= 32

Hope these help! :)

exis [7]3 years ago

5 0

First do the equations in the parentheses

(21)+(28) the first one isn't negative anymore because a negative times a negative is a positive.
Now we just add them, 21+28=49

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Answer:

The height of rectangle is 5 inches

Step-by-step explanation:

<u><em>The correct question is</em></u>

A rectangle is drawn so the width is 7 inches longer than the height. If the rectangle’s diagonal measurement is 13 inches, Find the height

Let

x -----> the width of the rectangle in inches

y ----> the height of the rectangle in inches

d ---> diagonal measurement of the rectangle in inches

we know that

Applying the Pythagorean Theorem

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we have

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$13^2=x^{2}+y^{2}$

$169=x^{2}+y^{2}$ ----> equation A

$x=y+7$ ---> equation B

substitute equation B in equation A

$169=(y+7)^{2}+y^{2}$

solve for y

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$2y^2+14y+49-169=0$

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solve the quadratic equation by graphing

using a graphing tool

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see the attached figure

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2 years ago

Say you want to buy x shirts which cost 2$ each and add tax which is $0.75. You have 13$ to make your purchase.

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EDIT:
2x + 0.75 = 13
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Hope this helps! A thanks/brainliest answer would be appreciated :)

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