Question

Notation: Describe the meanings of each of the following mathematical expressions or how they are commonly used in this chapter:

$x_k$

Short answer

In Riemann Sums, $x_k$ is the kth subdivision point in the subdivision.

$x_k=a+k\Delta x$

Step-by-step solution

Step 1. Given information.    

We are given an expression,

$x_k$

Step 2. Defining the expression 

In Riemann Sums, The kth subdivision point in the subdivision is $x_k$.

Such that,

$x_k=a+k\Delta x$