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

what is the point of intersection of the following systems of equations algebraically?
xy=8
x+y=6
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