exam Maths Puzzle Numerical Ability

I am having trouble. Can someone please help?
f(x)=4x-3
f(-1)

Thank you.

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exam Other Question

I need help to perform the indicated operation

f(x)=x+2 g(x)=x2 -1

I need to find (g of)(x) a student who correctly answered 72 questions correct on a test, received a 75%. how many questions were on the test?