Which one is bigger 17 quarts or 4 gallons

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.

Find the solution(s) to x^2-14+49=0

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?