# Riemann sums

Using rectangles to approximate the area under a curve practice problems.
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### Problem

Approximate the area between the x-axis and h, left parenthesis, x, right parenthesis from x, equals, 3 to x, equals, 13 using a right Riemann sum with 4 unequal subdivisions.
x3461013
h, left parenthesis, x, right parenthesis364812
The approximate area is
unitsstart superscript, 2, end superscript.