Hello I'm in AP calculus AB and I'm having trouble understanding how to do these questions. If you could help me understand by showing how to do it step by step for these 3 questions I would appreciate it. Thank you for all that you do.

4. Using the table below, find the area under f (x) using a trapezoidal sum with four subintervals. X -5 -3 0 1 5 f(x) 10 7 5 8 11 a ) b) Section 5.2 The Definite Integral Evaluate the definite integral by the limit definition using a right-endpoint approximation to generate the Riemann Sum. 5. [ x3 dx 6. S (2x2 + 3) dx