I'm not good at graphing, but desmos.com is an online graphing calculator that works really well.
To find the average, add the cost of each book to get a total cost, then divide the total cost by the number of books purchased.
Total cost: 32 + 45 + 39 = 116
Average cost: 116 / 3 = 38.67
I believe the answer is 2 :) .
The answer for this problem is D
A mountain road makes the horizontal
