Question

Based on the table, what is the rate of change of the total cost in dollars with respect to

the number of t-shirts ordered?
A. $9.95 per shirt
B. $12.16 per shirt
с. $1.70 per shirt
D. $11.88 per shirt

Answer 1

A) $9.95

Explanation:

if you take any two ordered pairs from the table, for example:

(13, 154.5) and (24, 263.95)

then the rate of change is the (difference of the y-values)/(difference of x-values)

rate of change (also known as 'slope') = (263.95-154.5)/(24-13)

= 109.45/11 which reduces to 9.95