What are the coordinates of the focus and the equation of the directrix? focus: (negative one-fourth, 0); directrix: x = One-fourth
focus: (one-fourth, 0); directrix: x = Negative one-fourth
focus: (–4,0); directrix: x = 4
focus: (4,0); directrix: x = –4

13

step-by-step explanation:

distance formula is d=√(x2-x1)^2   +   (y2-y1)^2

because linear equations are a lot simpler than quadratics equations, and linear equations formula is a lot easier to memorize. that's why i think they're harder.

my answer is$ 12

step-by-step explanation:

because 15 -2=12