let x=k
D=dog
T=Taxes
I=increase P=population
solve k
d=23,000
t=2000
d=2.3e^
divide both sides by 2
after year is,2000+k2-2.3
=1.999.7
k2- 23,000=
k-x
or
k2-2
I got 1/81
hope this helps.
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In short, for a vertical parabola, namely one whose independent variable is on the x-axis, usually is x², if the leading term coefficient is negative, the parabola opens downward, and its peak or vertex is at a maximum, check the picture below at the left-hand-side.
and when the leading term coefficient is positive, the parabola opens upwards, with a minimum, check the picture below at the right-hand-side.