(a) In each case, determine if the method of substitution is appropriate in order to evaluate the integral. 5 + dx ---Select--- e-t (5 + e-t)6 dt ---Select--- (b) Fill in the information to show the necessary work needed to evaluate x2 sin(4 + 5x³) dx using the method of substitution. Use a substitution that does not require another substitution to evaluate the integral. u = du = Rewrite the integral in terms of u only. Evaluate the integral.