What is the equation for this graph in standard form

The vertex is at (-3,-2) on the graph; the vertex equation is (x- -3)^2 +-2 =y; (x+3)^2 -2=y; now put this in standard form x^2 +9+6x-2=y; x^2 +6x+7=y

the right system of equations to describe the situation would

be on the form:

x1 = 8000 + y1*t

and

x2 = 8000 + y2*t

where x1 and x2 represents the total money of imogene and her

friend respectively at the end of t years.

now for the value of amount earned, y1 and y2:

y1=8000*0.08

y2=2000*√(t-2)