Approximate 13 dx 15 X using each of the following Riemann sums with 4 subintervals of equal length. Do not simplify your answer. (a) Left Riemann Sum (b) Right Riemann Sum = (c) Midpoint Rule =Approximate 0 2. 14 In(x) dx N using each of the following Riemann sums with 4 subintervals of equal length. Do not simplify your answer. (a) Left Riemann Sum (b) Right Riemann Sum = (c) Midpoint Rule -Approximate 3x + 1 dx sing each of the following Riemann sums with 3 subintervals of equal length. Enter the exact numerical value of each approximation. (a) Left Riemann Sum = 114 (b) Right Riemann Sum = 114 (c) Midpoint Rule = 114