a phone companys calling plan is represented by this graph.\nis the cost for each minute used?\na. $0.10 per…

Answer:

A. $0.10 per minute

Explanation:

Step1: Assume two points on line

Let's assume two points ((x_1,y_1)) and ((x_2,y_2)) on the line. If we assume ((x_1 = 10,y_1)) and ((x_2=20,y_2)) and assume the line passes through ((10,1)) and ((20,2)) (by looking at the grid - like pattern and assuming cost is on the y - axis).

Step2: Calculate slope

The slope (m) of a line is given by the formula (m=\frac{y_2 - y_1}{x_2 - x_1}). Here, (m=\frac{2 - 1}{20 - 10}=\frac{1}{10}=0.1). The slope of the line representing the cost - time relationship gives the cost per minute. So the cost per minute is (0.10) dollars per minute.