If there is 495,523 x 2-3x8 divided by 5 with ramanders

Issof claims that the scale factor is 1/2. which statement about his claim is correct

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.

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.