book Maths Puzzle Numerical Ability

Can you help me please?
If the cost equation for a product is give by C=2x^2+32, find the marginal cost. How would I find this?

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book Other Question

twenty-one minus the sum of fifteen and five
How would i write this problem out in mumerical form I'm not sure how to get the square root of 15/24y^5
Could you help me? thanks!