Question 1135394
let the distance of the ladder from the wall be x
:
Use Pythagorean Theorem
:
12^2 +x^2 = (x+4)^2 
:
144 +x^2 = x^2 +8x +16
:
8x = 128
:
x = 16
:
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the length of the ladder is 16 +4 = 20 feet
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