Answer:
145 feet
Step-by-step explanation:
The computation of the elevation of the bottom of the canyon is shown below;
Given that
A = sea level
B = The point at which the canyon starts
C = Canyon bottom
AB = 40 feet
BC = 105 feet
Based on the above information
The AC or elevation of the canyon bottom is
AC = AB + BC
= 40 feet + 105 feet
= 145 feet
