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Over- and under-estimation of Riemann sums

AP.CALC: LIM‑5 (EU), LIM‑5.A (LO), LIM‑5.A.1 (EK), LIM‑5.A.2 (EK), LIM‑5.A.3 (EK), LIM‑5.A.4 (EK)

Problem

Function f is continuous and decreasing.
We're interested in the area under the curve between x, equals, minus, 8 and x, equals, minus, 2, and we're considering using left and right Riemann sums to approximate it.
Order the areas from least (on top) to greatest (on bottom).
Stuck?
Stuck?