exam Maths Puzzle Numerical Ability

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?

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exam Other Question

A coupon book for a brisge costs $21 per month. The toll for the brisge is normally $2.50, but it is reduced to $1 for people who have purchased the coupon book.

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

Thank you.