If the directrix is a vertical line through the point (4, 0) and the vertex is located at the origin, is the parabola a vertical or horizontal parabola? Which direction does the parabola open?

a is the correct

5   1/4   miles per hour

step-by-step explanation:

15   3/4 / 3 = 5   1/4

x=0

step-by-step explanation:

the functions have the same rate of change i think. i narrowed it down to this answer and "the rate of change of tour 1 is greater" but i got it wrong using that answer so im assuming its the answer above. (this is a question i also answered from the iready site if anyone needs a reference)