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nadya68 [22]
3 years ago
11

This is my last question. Please help me!

Mathematics
1 answer:
sesenic [268]3 years ago
3 0

Okay so first you want to simplify the given equation  (7x+3y)(7x-3y)

in order to do this you multiply the first number of the first equation (7x) with the first number of the second equation (7x) this gives you 49x^2

Now you want to multiply the second number of the first equation (3y) by the second number of the second equation (-3y) this gives you -9y^2

Its as easy as pie!

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The length of a rectangle is five times it’s width. If the perimeter of the rectangle is 120 yd, find it’s area
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Answer:

Because the Length is 5 times the width, L(length) = 5w. You can use this information to update your perimeter.

P= L + W

P= 5w + w = 6w

P = 120, 120= 6w

120/6 = 6w/6

20 = w

L = 5w, L = 5(20) = 100

A = L x W, 100 x 20 = 2000

This means 2000 is the area

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Cassie bakes cookies and brownies for the school bake sale. Each cookie will sell for $0.50 and each brownie will sell for $0.75
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T= total money raised
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Total money earned equals the price per cookie times number of cookies sold plus the price per brownie times the number of brownies sold.

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Hope this helps! :)
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