Are the triangles similar!? explain

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Lindsay used two points, (x, y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

What is the value of x in the following equation. -x ^3/2 = -27