At Darren's Hats, there are 42 baseball caps and 14 other hats. what percentage of the hats are baseball caps?

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.

In which form is the following function written? y = - 2(x – 3)(x + 5)

Ineed with math stuff it involves graphs