Solve ax-7=b. solve for the letter a only!

Solve for x i'll try to attach the files bc it's not letting me for some reason

Arational number that is equivalent to -20/4?

When a 757 passenger jet begins its descent to the ronald reagan national airport in washington, d. c., it is 3900 feet from the ground. its angle of descent is 6 degrees. how far must the plane fly to reach the run way? a. 37,106 ft b. 37,310.4 ft c. 23,456.6 ft d 2,492.7 ft