If a waste line is pitched 1/8 inch per foot over a distance of 72 feet, what is the difference in elevation of the two sleeves?

To find the difference in elevation of the two sleeves for a waste line pitched at a slope of 1/8 inch per foot over a distance of 72 feet, you multiply the pitch by the distance.

The pitch of 1/8 inch per foot means that for every foot of horizontal distance, the pipe will drop 1/8 inch. Over a total distance of 72 feet, the calculation is as follows:

1. Convert the pitch into a decimal for easier calculation: 1/8 inch is equal to 0.125 inches.

2. Multiply the pitch by the total distance: 0.125 inches/foot × 72 feet = 9 inches.

The correct elevation difference as calculated here is indeed 9 inches. The presence of choices can create confusion, especially if there's a misinterpretation of the question or conditions. However, based on this calculation, option B (which represents 9 inches) accurately represents the difference based on the provided slope and distance.

It's important to approach similar problems by clearly understanding the pitch and performing the necessary multiplication. If there’s an implication that suggests 10 inches is the right calculation, it may stem from a misunderstanding of how the pitch should be applied to the distance.