A. You would use base*height (bh). You would multiply 4 and 5. The answer is 20in.
B. It would be 1/3*bh. The answer would be 6.6.
        
             
        
        
        
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<u>The answer is </u><u>6x³ - 72x² +288 -384</u>
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 This is an exact answer. the answer will be a bit larger than 20