Answer:
F(8)=120
Step-by-step explanation:
f(x)=15x
f(8)=15(8)
f(8)=120
x= -0.62 or -5.38
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H) 320 square units for the surface area
20(5.2+5.25+4.5) + 2(1/2(4*5.25)) = 320