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Posted by **PLEASE HELP** on Wednesday, January 26, 2011 at 8:16pm.

A= 1/2(a +b)h

I've tired over and over but still can't find the answer

- Math -
**Reiny**, Wednesday, January 26, 2011 at 8:18pmmultiply both sides by 2

2A= (a+b)h

divide both sides by (a+b)

2A/(a+b) = h

all done.