exam Maths Puzzle Numerical Ability

Could you please help me with this problem? Thank you in advance.
P(x) = -0.01x^3 + 52.92x + 4500

Find the optimal value of x=

Find the optimal value of P=

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exam Other Question

Hello out there,I need some help with some tough problems,the first one is,Determine whether sqrt67 is rational or irrational.If it is irrational,find two consecutive integers betw Simplify the expression:
3 - [7x + 2y - {5x - 9y} + 2x + 4y]