exam Maths Puzzle Numerical Ability

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?

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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). If one-half thenumber is subtracted from five-sixths of the number,the difference is 6. Find the number