When a number is decreased by 20 of itself the result is 56?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Pls as soon as ! will award brainliest and 20 ! also the answer is not 22.5 degrees! find the value of x in each case:

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?