help with some calc questions

Approximate the area under the parabola y = x" from 0 to 1, using three equal subintervals. The approximate area is (Simplify your answer.)Approximate - (3 + x" ) dx using five equal subintervals. -3 An approximation for the integral using five equal subintervals is (Simplify your answer.)Approximate - 2x dx using four equal subintervals. - 3 An approximation for the integral using four equal subintervals is (Type an integer or decimal rounded to three decimal places as needed.)Approximate 2 sin xdx using two equal subintervals. O An approximation for the integral using two equal subintervals is (Type an exact answer, using x as needed.)Express the limit below as a definite integral. The n points X,