Answer : 6220 lb/ft2
y=[tex] -0.065x^2+6.875x+6200 [/tex]
Where y is the amount of sugar (in pounds per square foot) and
x is the amount of fertilizer (in pounds per square foot)
We need to find the amount of sugar produced when 3 pounds per square foot of fertilizer is used.
We plug in 3 for x and find out y
y=[tex] -0.065x^2+6.875x+6200 [/tex]
y=[tex] -0.065(3)^2+6.875(3)+6200 [/tex]
y = -0.585 + 20.625 + 6200 = 6220.04
6220 lb/ft2 is the amount of sugar produced.
