### Home > PC3 > Chapter 12 > Lesson 12.1.4 > Problem12-72

12-72.

Use $79$ left endpoint rectangles to approximate the area under $g(x) = 0.7^x + 6$ over the interval $59 ≤ x ≤ 68$.

$\frac{68-59}{79}$

$x_0 = 59, x_1 = 59\frac{9}{79}, x_2= 59\frac{18}{79}, ..., x_n = \:?$

$\displaystyle \sum _ { n = 0 } ^ { 78 } \text{width} \cdot g(x_n)$