Answer:

Step-by-step explanation:
Given
, to solve for
, our goal is to isolate
.
Take the square root of both sides:
(recall that
).
Therefore, we have two cases:

Answer:
A
Step-by-step explanation:
The altitude of the top of the hill is -86ft, (because -191+105=-86) and -125 is 66 ft higher than -191 (because the difference of 191 and 125 is 66)
1km=1000m = 100000cm
86000cm= 0.86km