b g(b) Use the Substitution Formula, f(g(x)) . g'(x) dx = f(u) du where g(x) = u, to evaluate the following integrals. a Hu ) dun g(a) N 2 a. 10r dr b. 10r - 2 (12 + 8 ) 2 (12 + 8 ) 2 dr 0