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AVprozaik [17]
3 years ago
8

Ritchie wants to paint his bedroom ceiling and four walls. The ceiling and each of the walls are 8 feet by 8 feet. A gallon of p

aint covers 40 square feet.Write an expression that can be used to find the number of gallons of paint Richie needs to buy.
Mathematics
1 answer:
Oksanka [162]3 years ago
4 0
Well i think that it would be 8×8-40 and that would come out to a solution of 28
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Answer:

FIRST EXPRESSION:

-  If b=-3, the value of 4b(b+1) is  24

-  If b=-2, the value of 4b(b+1) is  8

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 SECOND EXPRESSION:

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-  If b=-2, the value of (2b+7)(2b-8)) is  -36

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Yes, for any value of "b" the value of the first expression is greater than the value of the second expression.

Step-by-step explanation:

Substitute the given values of "b" into each expression and evaluate.

- For the first expression 4b(b+1), you get:

If b=-3 → 4(-3)(-3+1)=24

If b=-2 → 4(-2)(-2+1)=8

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 - For the second expression (2b+7)(2b-8)), you get:

If b=-3 → (2(-3)+7)(2(-3)-8)=-14

If b=-2 → (2(-2)+7)(2(-2)-8)=-36

 If b=10 → (2(10)+7)(2(10)-8)=324

You can observe that for any value of "b" the value of the first expression is greater than the value of the second expression.

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