12. 3 8 Suppose f(x)dx = 4, [ f(x)dx = -7, and g(x)dx = 5. Evaluate the integrals in parts a - d. 0 3 3 3 a ste [5f(x) dx = [ (Type an integer or a decimal.) 8 b. -2g(x) dx = [ (Type an integer or a decimal.) 8 c. [[6f(x) = g(x)]dx = [ (Type an integer or a decimal.) 8 3 d. [[f(x) + 3g(x)]dx = [ 8 (Type an integer or a decimal.)