Since this is a parabola, there are no limits to the x-values, but there is a limit on the y-values: the y-values cannot exceed the highest or lowest point of the parabola, the vertex.
If you mean lowest terms as in fully simplified, then your fraction "2/11" is already in lowest terms. Lowest terms mean that your numerator and denominator have no common factors apart from 1.
2 and 11 don't have any common factors, therefore 2/11 is in lowest terms already.
