18. [-/1 Points] DETAILS SCALCET9 5.5.003.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Evaluate the integral by making the given substitution. (Use C for the constant of integration.) x2 V x3 + 15 dx, u= x3 + 15 Need Help? Read It Watch It Master It Submit Answer 19. [-/1 Points] DETAILS SCALCET9 5.5.015.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Evaluate the indefinite integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.) dx 4 x + 5 Need Help? Read It Watch It Master It Submit Answer 20. [-/1 Points] DETAILS SCALCET9 5.5.033. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Evaluate the indefinite integral. (Remember to use absolute values where appropriate. Use C for the constant of integration.) 9 sec (0) -de tan(0)