evaluate the function?

how do i evaluate the function f(x)=15x+4 when x=-3,0 and 2? i know there are supposed to be 3 different answers but i dont know if i was doing this right.
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1 Answer

y=15x+4....

evaluzte at x=-3, yu get 15*(-3)+4=-45+4=-41

evaluate at x=2...(2*15) +4=30+4=34
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