172k views
4 votes
Can someone help me

Can someone help me-example-1

1 Answer

5 votes
The standard equation of a parabola :
(y-k) = a(x-h)². h and k being the coordinates of the vertex, then:

y-3 = a(x-0) → y = ax² + 3

Let's calculate a (from the table):
if x = 1 → y =2 Plug in y = ax² + 3
2 = a(1²)+3 → a = -1

And the equation becomes : y = - x² + 3
For x = 9 → y = - 78
For x = 10 → y = -97

Average rate of change = (y₂-y₁)/(x₂-x₁) = (-97+78)/(10-9) = - 19 (Answer A)

User Jmenezes
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories