Answer:
Part 1:
Part 2:

Part 3:

Part 5:
The height:

The time:
s
Step-by-step explanation:
Is a quadratic equation.
Part 1:
We use
to factor quadratic equations
a=1 b=-9 c=20



we solve both possibilities



The factored form would be

Part 2:
We use the formula to find the x coordinate of the vertex of a parabola


a=1 b=-9 c=20

Now we substitute the value of <em>x</em> in
to find the value of the coordinate <em>y</em> of the vertex

The vertex of the parabola is
Vertex:

Part 3:
the y-intercept is when the value of x = 0.
We substitute this value in 

The y-intercept is 
Part 5:
<em>A.</em>
Between 4s and 5s
<em>B and C.</em>
<em> </em>Erin's photograph is taken at the lowest point of the roller coaster.
The lowest point of the parabola is the vertex.
The coordinate <em>y</em> of the vertex gives us the height and the coordinate <em>x</em> the time.
The height:
<em>It is negative because it is below the point we take as zero.</em>
The time:
s
Part 4:
The answer is the graph