If b = 5.7 which equation is true? a - 3+b= 6 b- b-2= 5.5 c- b+4.4= 9.1 d- 6-b= 0.3

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.

True or false look at the picture pls : /

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !