Find an equation of a parabola with a vertex at the origin and directrix y = -4

Which number is irrational? a) 16 b) 18 c) 25 d) 36

What is the measure of angle z in this figure? enter your answer in the box. z = ° two intersection lines. all four angles formed by the intersecting lines are labeled. clockwise, the angles are labeled 43 degrees, x degrees, y degrees, and z degrees.

Which term best describes the association between variables a and b