Find domain of g

g(x)=x+5/2x^2-x-3

Can anyone me with 32,33,36,37,and 40.

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.

Sum is 17 and their difference is 3