+136 The rectangles in the graph below illustrate a left endpoint Riemann sum for \(\displaystyle f(x) = \frac{x^2}{12} \) on the interval \(\lbrack 2, 6 \rbrack\). The value of this Riemann sum is (?), and this Riemann sum is an underestimate of the area of the region enclosed by \( \displaystyle y = f(x)\), the x-axis, and the vertical lines x = 2 and x = 6.
What is the value of this Riemann sum?
Left endpoint Riemann sum for \(y = \frac{x^2}{12} \) on \(\lbrack 2, 6 \rbrack\)
