In the formula for average rate of change, what does the triangle in front of the x and y stand for?

a. interval between x and y

b. initial value of x and y

c. delta notation-change in y over change in x

d. the percent rate of change of y and x

The triangle in front of the variables x and y in the average rate of range is the delta notation - change in y over change in x. Thus, the answer is letter C. In a Cartesian plane, the value of change in y over the change in x is the value of the slope.