I need help to solve the problem below a, b, c, d and e thanks

1. Given ffx) dx where f(x) 2 0 : (15 points) a. Explain using your own words what this definite integral represents. b. Explain using your own words what the indefinite integral represents {I x) dx). c. Explain using your own words how would your explanation in part (a) change if we have f(x) 2 Owhen 1 5x 5 1.5 andf(x)