SOLUTION: A=1/2bh if A=450 and h=9 I know the answe is 100. i just don't know to to solve the problem

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Question 340116: A=1/2bh if A=450 and h=9

I know the answe is 100. i just don't know to to solve the problem
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
450=1/2b*9
450=4.5b
divide by 4.5
b=100