Nonlinear because y is squared
what are the fractions?
1/3 is a repeating decimal
There are uncountable real numbers between the square root of 13 and the square root of 14.

and

Some of the real numbers between 3.605551275 and 3.741657387 are 3.61, 3.62, 3.63, 3.64, 3.65, 3.66, 3.67, 3.68, 3.69, . . . . (like i said before, they are uncountable).