Help please
Fill in the blank by entering just a number for your answer.

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.

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?