Question

"Calculate the solution to the following problem.Horizontal run = 85 feetChange in elevation per foot = -1/4""What is the change in elevation over 85 feet?

A) 0.5 feet
B) 1.8 feet
C) 21.25 feet
D) 85.0 feet

Answer 1

The total change in elevation over 85 feet, given a constant change of -1/4" per foot, is a decrease of 21.25 feet. The correct answer to the question is (C) 21.25 feet.

Step-by-step explanation:

The question involves determining the change in elevation over a certain horizontal distance when a consistent change in elevation per foot is given. To find the total change in elevation, we multiply the horizontal run by the change in elevation per foot:

1. Horizontal run: 85 feet
2. Change in elevation per foot: -1/4" (-0.25 feet)
3. Total change in elevation = Horizontal run × Change in elevation per foot
4. Total change in elevation = 85 feet × (-0.25 feet)
5. Total change in elevation = -21.25 feet

The negative sign indicates that there is a decrease in elevation. Therefore, the change in elevation over 85 feet is 21.25 feet. The correct option, taking into account the decrease in elevation, is C) 21.25 feet.