Please show all work and steps thank you i don't get this aspect of integration

Suppose J and g are continuous and all of the following conditions are true. f(x) dx =7, f(x) dx = 3, - g(x) dx =-12 , g(x) dx = -4 , J is an odd function and g is an - 3 even function. Evaluate the following integral. -2 a. [3f (x) - 58(x) ]dx = b . f ( x) dx = 0 -3 0 b . 8 (x) dx = d. [f (x- 3) dx = (Use U-subs) -3