Answer:
The length is 6
I believe that he makes $45.84.
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Step-by-step explanation:
f(x) = -139
f(x) = 3x^2 + 10 If f(-7)
f(-7)= 3 * -7^2 + 10
F(-7) = 3 * -49 + 10
f(-7) = -147 + 10
f(-7) = -139