Answer:
121 yard
Step-by-step explanation:
By differentiating
[tex]y=2.2x-0.01x^{2} \\\\[/tex]
[tex]\frac{dy}{dx} =2.2-0.02x=0\\x=110\\so\\y=2.2*110-0.01*110^{2} =121yard[/tex]
