Answer:
[see below]
Step-by-step explanation:

Hope this helps.
On the 21st day; the 7th day of the back medication and the 3rd day of the asthma medication.
Hmmm the y-intercept is at -2? what does that mean? well, is where the graph "intercepts" or touches the y-axis, and when that happens, x = 0, so the point is really ( 0 , -2 ).
and we know where the vertex is at. Let's assume a vertical parabola, in which case the squared variable is the "x".