exam Maths Puzzle Numerical Ability

a student who correctly answered 72 questions correct on a test, received a 75%. how many questions were on the test?

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

Thank you.
give the y values for x=-2,-1,0,1,2,3 for the function y=1/x-1