Left Riemann Sum From a Table

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Selected values of a continuous function $f$ are shown in the table below.

$x$	$0$	$25$	$30$	$50$
$f(x)$	$4$	$6$	$8$	$12$

What is the left Riemann sum approximation of $\displaystyle\int_0^{50} f(x) \, dx$ using the three subintervals indicated by the table?

380

290

360

390

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