Michael is practicing the piano. he spends 1/2 hour practicing scales and 1/4 hour practicing the piece for his recital. what is the common denominator for 1/2 and 1/4?

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