We will use vertex form of the parabola:
Where (h,k) is the vertex of our parabola. We know that focus and directrix are located at the same distance from the vertex. That distance is a.
We can use this to build a system of equations to calculate a and k. We already know that h=-5, keep in mind that focus and vertex share the same x coordinate.
We just add these two equations together:
We plug this back into the first equation:
That's all the information we need to write down the equation:
None of the answers you provided are correct.
Answer:
3
Step-by-step explanation:
10.125 feet because 4.5/2 is 2.25 and 2.25 x 4.5= 10.125
11×11×11=1331
12×12×12=1728
13×13×13=2197
14×14×14=2744
15×15×15=3375
16×16×16=4096
17×17×17=4913
18×18×18=5832
The circumference of a circle is proportional to its diameter.
Now, when d=1, C=π, therefore:
k=π
This means that:
If C=15π:
15π=πd
Therefore:
d=15