A botanist was monitoring the growth of a type of plant during its first year. The function f(x) models the average height of the plants, in inches (in) , where x is the amount of rain the plants received, in centimeters (cm) . The graph of f(x) is shown.
Select all the possible equations of f(x):
f(x)= -5x^2-7820
f(x)= x^2-80x+1780
f(x)= -5(x+40)^2+180
f(x)= 5(x-40)^2+180
f(x)= -5x^2+400x-7820
f(x)= -0.033(x+40)^2+180