Can I get help with this?

a = 2, b = 8, c = 10, d = 16

Let a be the last digit in your student number, b be the second-to-last digit in your student number, c = 5a and d = 2b. For the functions f and g defined as: f: Z rightarrow Z f(x) = ax + c and g: Z rightarrow Z; g (x) = c^2 - d, compute the following a. f overrelay g b. g overrelay f C. (f overrelay g) overrelay g