When in doubt guess C. Always works for me
Answer:

Step-by-step explanation:
First, subtract by 7 both sides of equation.

Solve.


Then, divide by 12 both sides of equation.

Solve to find the answer.

, which is our answer.
The triangle to solve for has a leg or 12 feet, hypotenuse of 20 feet, so solve for Pythagoras

for a

a = 16 feet
Answer:
5.47 is the square root of 30