exam Maths Puzzle Numerical Ability

Given f(x)=2x-8, find f(3).

Thanks so much for the help.

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exam Other Question

CAN SOMEONE CHECK THIS PLEASE?
FUNGICIDES ACCOUNT FOR 1/10 OF THE PESTISIDE USED IN THE USA. INSECTICIDES ACCOUNT FOR 1/4 WRITE RATIO TO THE SIMPLEST FORM.

1/10 DEVIDED BY 1/4
= 1/40 Solve this equation.
5^x^3 = 25^x
x =________________(smallest value)
x =
x =__________________(largest value