Approximating Areas with Riemann Sums

AP Calculus AB· difficulty 3/5

For a concave-down function, the trapezoidal rule produces

A
$Exactly correct$
B
$An underestimate$
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C
$An overestimate$
D
$Same as left sum$

Explanation

Concave down: chords lie below the curve \to trapezoid sum underestimates the integral.

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