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Please help asap

 Sep 11, 2018
 #1
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21. SA = 2(LW + LH + WH)
2[(x+3)(x+7)+(x+3)(x-1)+(x+7)(x-1)]
2[(x² + 7x + 3x + 21) + (x² - x + 3x - 3) + (x² - x + 7x - 7)]
2[(x² + 10x + 21) + (x² + 2x - 3) + (x² + 6x - 7)]
2(3x² + 18x + 11)
6x² + 36x + 22


22. A = (bh)/2
14x⁵ + 63x² = (7x²h)/2
28x⁵ + 126x² = 7x²h
(28x⁵ + 126x²) / 7x² = h
(28x⁵ / 7x²) + (126x² / 7x²) = h
4x³ + 18 = h

 Sep 11, 2018
 #2
avatar+2442 
+1

Thanks so much for your help!

RainbowPanda  Sep 11, 2018

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