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

The formula P=0.64x^2-0.045x+1 models the approximate population P, in thousands, for a species of fish in a local pond, x years after 1997. During what year will the population reach 64550 fish? Please help me solve this problem, the problem states to solve: 6x^2+13x-5=0