38.72 X 10 to the power of 4

Elizabeth claims that the fourth root of 2 can be expressed as 2^m since (2^m)^n = 2. find the values of m and n for the case where elizabeth's claim is true.

The sum of the speeds of two trains is 720.2 mph. if the speed of the first train is 7.8 mph faster than the second train, find the speeds of each.

You buy a veido game for $60 and the sales tax is 8% what is the total cost for the game including the sales tax