Respuesta :
use the Pythagorean
the whole length of the ladder is the hypotenuse
[tex] x^{2} +7 ^{2}=12 ^{2} [/tex]
49+x=144
-49 -49
9.75
the whole length of the ladder is the hypotenuse
[tex] x^{2} +7 ^{2}=12 ^{2} [/tex]
49+x=144
-49 -49
9.75