Does any know how to solve this problem

Use set buikder notation to represent the following set: {, -2, -1, 0}

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.

Explain how you can use the associative property to evaluate (7x50)x4.