(1 point) Let L²fx f(x) dx = 7, * f(x)dx = -15, ² 8(x g(x) dx=-8, L g(x) dx = 13, Use these values to evaluate the given definite integrals. a) (f(x)+g(x)) dx = b) (f(x) g(x)) dx = c) (3f(x)+2g(x)) dx = d) Find the value a such that (af(x)+ g(x)) dx = 0. a =