Posted by DEBBIE on Wednesday, April 28, 2010 at 4:13am.
first one:
3h/2 = 30
multiply both sides by 2
3h = 60
divide both sides by 3
h = 20
second one:
3(3+r)= 2r+4
expand
9 + 3r = 2r + 4
3r - 2r = 4 - 9
r = -5
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