The domain of any quadratic function regardless of the direction it opens(up, down, left, right) is always all real numbers. (True or false)

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

Which is the scale factor proportion for the enlargement shown?

X^2/100+y^2/25=1 the length of the major axis is: a)5 b)10 c)20