Anyone know what the vertex would be ?

Step-by-step explanation:

The graph of the parabola passes through the points (-1,0), (0,-1) and (1,4).

Let be the equation of the parabola. Substitute the coordinates of the points:

Substitute into the first and third equations:

Add them:

Hence,

Find the vertex:

So, the vertex has coordinates

a is the correct

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.