Solve the formula 9/5c + 32=f for c and use the resulting formula to find the tempeture in degrees celsius when the fahrenheit tempeture is 77

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