algebra

A student makes a \$8.75 purchase at the bookstore with a \$20 bill. The store has no bills and gives the change in quarters and fifty cent pieces. There are 30 coins in all. Hoe many quarters are there? How many fifty-cent pieces

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1. 30=q+f
.25q+.5f=(20-8.75)

solve for q, f

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2. Find the product
could you check to see if I am right
(2x+3)(5x-4)=10x-12=x=22
(3a-4b)(3a+4b)=9a-16b
could you check these for me. thank

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3. (2x+3)(5x-4)=
10x-12=
-2

(3a-4b)(3a+4b)=
9a-16b

Could someone check these problem for me, please

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4. could someone check these problem please

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5. What is the v olume of a box whose length is 12-2x, width is 7-2x and height is x?

help me

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6. 30

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posted by 99

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