<span>Rock, Carbon, Water, Nitrogen</span>
Assume the parabola is placed on a graph where the x-axis is the top of the dish.
The vertex is then at (0,-30) The x-intercepts or zeros are at (-30,0) and (30,0)
The equation of such parabola would be:

Plug in vertex to find value of 'a'

Now find the focus given that


Answer: the microphone should be placed 7.5 inches from vertex.
Answer:
i) Because so that we can understand them steps by step
ii)We could enjoy when we study in school
Ummm is this a full question?