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

  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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