exam Maths Puzzle Numerical Ability

Simplify the expression:
3 - [7x + 2y - {5x - 9y} + 2x + 4y]

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exam Other Question

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= Graph y=2x-1