Respuesta :

Answer:

For f(5x) we replace x by 5x in function ...

f(5x) = -9(5x) +7

f(5x) = -45x +7

Step-by-step explanation:

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renjunhwang66

Answer:

f(x) = -9x+7

f(5x)= -9(5x)+7

5x=-45x+7

-7=-45x/5x

-7=-9x

-7/-9 =x

x=0.7