Which regression equation best fits these data? a. y = -0.59x + 12.5 b. y = 12.00 * 0.94^x c. y = 0.30 x^2 + 0.48 + 15.83 d. y= -0.30x^2 - 0.48x + 15.83

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.