Answer question this has another part which will be shown after 1st part is answered

He concluded that a heavier object dropped from the same height as a lighter object will land

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

If a and −a are numbers on the number line, which expression must give the distance between them? a) 0 b) a c) |2a| d) |a|