Convert 27/10 into a mixed number

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.

If two points are given,then exactly one line can be drawn through those two points.which geometry term does the statement represent

Plssssssss on #2 and show me how to solve it