​Raphael's Gym has a climbing wall that starts in the​ gym's basement, 9 feet beneath the ground level. The wall extends to 21 feet above the ground level. Complete questions 15 below.

Question content area bottom
Part 1
1. What is the total height of the climbing​ wall? Represent the situation with a number line.​ Then, explain how you found your answer.
The climbing wall is
  
enter your response here feet tall.
​(Type an integer or a​ decimal.)
Part 2
Which number line represents the​ situation?

1 answer

The total height of the climbing wall is 21 feet - (-9 feet) = 30 feet tall.

The number line that represents the situation is:
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21.