Question 36668
Hello, I can help you lol.
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First let me give you the formula 
A= (b1+b2)/2 X h OR A= 1/2h (b1+b2)
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i will use the second one  ^^^
A= 1/2h (b1+b2)
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now plug in the Numbers:
84=1/2h(28)
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the next step is to multiply 28 by 1/2
28/2=14
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You are left with:
84=14h 
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divide both sides of the equation by 14
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you get:
84/14=6
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So h=6
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to check the problem simply plug in the numbers:
84=1/2(6) (28)  multiply 6*28=168
84=1/2(168)
84=84
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If you have any questions you can e-mail me at Southqueensb@yahoo.com
~EVY~