Evaluate the definite integrals using properties of the definite integral and the fact that 3 7 7 3 f(x) dx = -3, f(x) dx = 12, and g (x) dx = 6. 13 (a) 6f (x) dx = Number (b) f (x) dx = Number .7 (c) (f (2) - g(a)) dac = Number 3 7 (d) (4f (2) + 5g (x)) dac = Number