## anonymous 5 years ago The function i(t)=-0.1t^2 + 1.4t represents the yearly income (or loss) from a real estate investment where t is time in years. After what year does income begin to decline.

1. anonymous

vertex if this parabola is $\frac{-b}{2a}=\frac{1.4}{.2}=7$

2. anonymous

since the parabola faces down it increases and then decreases, so answer is after 7 years..

3. anonymous

ok. thanks. medal.

4. anonymous

welcome