Answer:
The total height of the climbing wall is 12 feet
Step-by-step explanation:
The given parameters are;
The star of the climbing wall = On the gym basement
The height of the gym's basement above the ground level = 9 feet
The height to which the wall extends above the ground level = 21 feet
The total height of climbing the wall = 21 - 9 = 12 feet
The start of the climbing wall is at the gym's basement level which is already 9 feet above the ground level, therefore, given the the height of the wall is 21 feet above ground level, with wall situated already at 9 feet above ground level which gives the total height of the climbing wall will be 21 - 9 feet or 12 feet.
