book Maths Puzzle Numerical Ability

i am supposed to find a value of "x", but i am not given the equation, only its derrivative. and when i integrate it, i get a value plus a constant, which i do not know. pls help

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Sorry this is a lot of questions, I hope you are able to help!

Find the present value of each amount:

15. $42,000 in 7 years, 12% compounded monthly

17. $1,347.89 in 3.5 write each expresssion in standard form and then classify it by degree and number of terms.

1.(-3x^2+5x)-(x^4-6+5x)

2.(x+2)(x^2-4x+1)