Left Riemann Sum from a Table

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The table below shows selected values for a continuous function $f$ .

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

What is the left Riemann sum approximation of $\displaystyle\int_0^{50} f(x) \, dx$ using the subintervals $[0,25]$ , $[25,30]$ , and $[30,50]$ ?

390

360

380

290

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