Let x represent cost of each ticket and y represent cost of parking.
We have been given that the Singh's spent $335 for 5 people and parking. We can represent this information in an equation as:

We are also told that the Robinson spent $465 for 7 people and parking. We can represent this information in an equation as:

Now we will use elimination method to solve our given system of equations.
Upon subtracting equation (1) from equation (2), we will get:




Therefore, the each ticket costs $65.
Upon substituting
in equation (1), we will get:




Therefore, the parking costs $10.
The standard equation for a parabola that opens upward parallel to the y-axis is x2=4ay, where a = distance from the vertex to focus. Vertex is at origin(0,0)
4a=2
a=2/4
a=1/2 or 0.5
the coordinate of the focus is (0, 1/2)
the equation of the directrix is y=-1/2
Step-by-step explanation:
there is no reason in maths only the method