Answer:
<h3>1/6 miles / min.</h3>
Step-by-step explanation:
speed = distance / time
= <u>1/12 mile</u>
1/2 min.
= 1/6 miles / min.
Answer: It is c
Step-by-step explanation:
As the directrix is parallel to x-axis, the concavity of the parabola will be in vertical. Then, the general equation is in the form:

, where

are the coordinates of the vertice and p is the parameter (distance between the focus and the directrix). The parameter is

. The vertice is the midpoint between the focus and the projection of the focus in the directrix. Then, the vertice is

. Hence, the parabola is:

Now, derivating: