Answer:
Step-by-step explanation:
The answer is 26
Answer: 
<u>Simplify both sides of the equation</u>
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<u></u>
<u></u>
<u>Flip the equation</u>
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<u></u>
<u></u>
<u>Subtract 91 from both sides</u>
<u></u>
<u></u>
<u></u>
<u>Divide both sides by -70</u>
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<u></u>
S=6a²
a=8mm
S = 6 * 8² = 6 * 64 = 384 mm²
-4.2, -3.5,-2.1,-1.5,-1,-0.5,0.5,2,3.5,4.8