How do you get 25 for the order of operations

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.

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?