Explain, in one or two sentences, why a left Riemann sum that uses five equal…

MATHEMATICS · Subjective · A Level · Mathematics · Integration · Integration

Problem

Explain, in one or two sentences, why a left Riemann sum that uses five equal subintervals to approximate ∫05f(x) dx\displaystyle \int_{0}^{5} f(x)\,dx must underestimate the true value when ff is strictly increasing on [0,5][0,5].

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