book Maths Puzzle Numerical Ability

Question:

"Suppose you are in charge of the design of a roller coaster ride. This simple ride will not make any left or right turns; that is, the track lies in a vertical plane

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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? please show me how this goes i dont know where to get the square root sign so i key it in this way (4x square root 3)^2-(3)^3 thank you