Answer:
42
Step-by-step explanation:
f(3)=2(3)^3-(3)^2-4(3)+9
f(3)=2(27)-(9)-12+9
f(3)=54-21+9
f(3)=33+9
f(3)=42
5,and don't forget who taught you how to fight kid.
The cost of 85 shirts is 400+7.5*85=1037.5
The average per shirt is 1037.5/85=12.206
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Thus :


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The answer is bla bla blahhh