Question

The equation y=−0.065x2+6.875x+6200 models the amount y of sugar (in pounds per square foot) produced where x is the amount of fertilizer (in pounds per square foot) used.

What is the best approximate for the amount of sugar produced when 3 pounds per square foot of fertilizer is used?



6200 lb/ft2 <my answer

6210 lb/ft2

6220 lb/ft2

6230 lb/ft2

Answer 1

I get 6220

That 6200 is unlikely, since the first two terms don't ad to zero...