Final answer:
The circumference of a 15" pipe is calculated using the formula C = πd, resulting in approximately 47.1 inches to the nearest tenth.
Step-by-step explanation:
The circumference of a circle is given by the formula C = πd, where C is the circumference and d is the diameter of the circle. For a 15" pipe, which specifies the diameter, the circumference would be π multiplied by 15 inches. Performing this calculation, using 3.14 as the approximate value for π, we have:
C = 3.14 × 15" = 47.1"
Therefore, the circumference of a 15" pipe is approximately 47.1 inches, rounded to the nearest tenth.