Which is the directrix of a parabola with equation x2 = 4y?

Two positive integers are 3 units apart on a number line. their product is 108. which equation can be used to solve for m, the greater integer? m(m – 3) = 108 m(m + 3) = 108 (m + 3)(m – 3) = 108 (m – 12)(m – 9) = 108

Could someone with number 1 and 2

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.