exam Maths Puzzle Numerical Ability

Could please help me with this question?

The function that relates the Cost ($) of an oil well to its Depth (x) in feet is as follows:
C(x) = -146,983 + 58.72 * x
Find and interpret C(3500).

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exam Other Question

could the following lengths form a trinagle? yes or no 1.) 7,5,2 2.) 9,12,13 3.) 12,2,19 I am stuck on correct answer for:

If x = 3 and y = -2, then 7x - 3y over 2x + y =

I believe answer is 27 over 4 but I need to verify my work. Can you show me the breakdown to get correct resolve?