Which could be the equation of the parabola? A parabola with a vertex at (0,0) has a directrix that
crosses the negative part of the y-axis,
O x2 = -4y
O x² = 4y
O y2 = 4x
O y2 = -4x

In 2014, the three largest economies in the world were (listed in order, from largest): a) the u.s., china, germany. b) the u.s., china, japan. c) china, the u.s., japan. d) china, the u.s., germany.