If 1/u=1/f-1/v is the formula Express f as the subject of the formula

Y=4x^2+x-1 solve using quadratic formula

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational 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.