help me please this qeustion is part of a finally grade for this semester!!!!
i would appreciate it!!

The following graph represents the hourly commission of a home appliance salesperson,
, based on the number of salespeople that are working the showroom floor,
. The graph of the hourly commission of the salesperson is a quadratic function. What is the equation for the function in standard form if the vertex is
and the origin is the only other known point?