The table gives the values of a function obtained from an experiment. Use them to estimate ∫⁹₃f(x) d(x) using three equal subintervals with

(a) Right endpoints

(b) Left endpoints

(c) Midpoints.

If the function is known to be an increasing function, can you say whether your estimates are less than or greater than the exact value of the integral?

x 3 f(x) -3.4 -2.1 -0.6 4 5 6 7 8 9 0.3 0.9 1.4 1.8