ANSWER
D. 25 feet
EXPLANATION
The height of the wall,h, the taut wire and the distance from the base of the pole to the point on the ground, formed a right triangle.
According to the Pythagoras Theorem, the sum of the length of the squares of the two shorter legs equals the square of the hypotenuse.
Let the hypotenuse ( the length of the ) taught wire be,l.
Then





Answer:
1. A, 2 meters per second
2. F, 15
9.) <
10.) <
11.) a.) chicago
11.) b.) chicago, minnesota, new york, houston
(13 - 5n) = 29
-5n = 29 - 13
-5n = 16
n = -16/5 or - 3 1/5