1) Approximate (3 + x x )dx with a left-endpoint Riemann sum using four equal subintervals. 2) Approximate tane de with a right-endpoint Riemann sum using four equal subintervals. 3) Approximate In(y + 1) dy with a midpoint Riemann sum using three equal subintervals. 4) Approximate [ (371)) dz with three trapezoids of equal width. 5) Approximate x -1 dx with a right-endpoint Riemann sum using four equal subintervals