What’s the answer to this question? i’m confused as to how to do this.

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.

The holiday party will cost $160 if 8 people attend. if there are 40 people who attend the party, how much will the holiday party cost

The vertices of a triangle are a(7.5), b(4,2), and c19. 2). what is