What is the length of ac?
a. 13
b. 16
c. 15
d. 3

When looking for the length, positive/negative does not matter. You literally just count from A to C or vice versa, and it will always be a positive number. In this case, point A is on -8 and point C is on 5. Counting the numbers of dashes(?) in between the two points, you will get A.13 as your naswer

A. 13 is your answer

hope this helps :D

Circumference = pi * diameter
Diameter = 15
Assume pi = 3.14
15 * 3.14 = 47.1 in.

The answer is A