exam Maths Puzzle Numerical Ability

If f(x) = -5x,then f(-3)

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exam Other Question

I do not know if my question belongs in this category. But it deals with inverse functions.

The function is f(x) =

1
----------------------
x^3 + 12x^2 + 48x + 4
A $23,000 car is purchased with a s$8300 down payment, the balance to be paid in 48 montly payments of $363.75 each, Find the total cost and the finance charge.