Pre-Algebra [repost]

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I'm sorry I had to repost, but this is urgent and i need it done by today!!
Can someone please show me how to do these problems? I've been trying but I'm having a hard time...

1.Simplify the expressions on each side of the equation to obtain an equivalent equation:
5x + 12 + 4x -16= 100/2

2.Angles UVW and angles XYZ are complementary angles. m of angle UVW is 18 degress less than m of angle XYZ. What is m of angle UVW?

3.After a 24% increase, the price of a tennis racquet was $37.82. What was it's original price?

Thanks so much!!
-MC

  • Pre-Algebra [repost] -

    1.
    5x + 12 + 4x -16= 100/2

    9x - 4 = 50
    9x = 54
    x = 6

    3.
    1.24x = 37.82
    x = ?

  • Pre-Algebra [repost] -

    2.

    let angle XYZ = x
    then angle UVW = x-18

    don't complemenatry angles add up to 90 ?

    so x + x-18 = 90
    solve for x, sub into x-18

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