An electronics store had a 20% off sale, if a stereo originally cost $125,how much did the stereo cost during the sale

Which of the following graphs represents the function f(x) = 2^x

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?