Answer:
9
Step-by-step explanation:
Let the equation of a parabola be
= 4ax.
Then , focal length of the parabola is a.
As , (0,0) is the vertex and its focus is (a,0)
Thus, focal length comes out to be a.
Here,
a is given as 9 units .
Thus focal length of the parabola, d, equals to 9 units
y = 4
or (0, 4)
intersecting the y-axis is basically when x is equal to 0.
1.5(0) +4.5y = 18
So your y-intersect is (0, 4) and thats when it intersects the y-axis.
The last one
Because it tells you what y is