The lenths of the 2 legs of right triangle abc show below are given in inches. The midpoint of ab is how many inches from A ?

The sum of two numbers is 86, and their difference is 20. find the two numbers

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.

An ant travels at a constant rate of 30cm every 2 minutes. at what speed does the ant travel per minute