25-26 Express the integral as a limit of Riemann sums using right endpoints. Do not evaluate the limit. 25. ( 4 + x2 dx 26. x 2 + dx X 27-34 Use the form of the definition of the integral given in Theorem 4 to evaluate the integral. 27. 3x dx 28. J. x2 dx 29. (5 x + 2) dx 30. S (6 -x2) dx 31. (3x2 + 7x) dx 32. ( 4x 2 + x + 2) dx 33. (x3 - 3x2) dx 34. (2x - x3) dx