The table gives the values of a function obtained from an experiment. Use them to estimate ∫60 f(x) dx using three equal subintervals with
(a) Right endpoints,
(b) Left endpoints, and
(c) Midpoints. If the function is known to be a decreasing function, can you say whether your estimates are less than or greater than the exact value of the integral?

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5. f(x) 9.0 9.3 2.3 -7.6 6.5 8.3 -10.5