Five friends ran a race their finishing times were 12.871 , 12.71, 12.178 , 12.781

Ahigh definition tv cost $800 with a down payment of 2/5 of the cost. how much is left to pay, in dollars after the down payment has been made?

What properties allow transformation to be used as a problem solving tool

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.