having difficulty with the last part of the question. please explain.

Interpret the definite integral as a Riemann sum in terms of constants and n. representing n subintervals, only. O in OE ( 5 - # ) . " (5 - 50) . 4 Calculate the value of the definite integral using Riemann sums, (Express numbers in exact form. Use symbolic notation and fractions where needed.) (5- 5x) dx = -20 Identify the true statements about the definite integral. The definite integral represents a negative area. The definite integral represents an area. Of is negative on the interval (0, 4). The definite integral does not represent an area. ( S is nonnegative on the interval (0, 4]