Question

the polynomial function i (t)=-0.1t^2+1.6t represents the yearly income (or loss) form a real estate investment where t is time in years. after what year does income begin to decline

Answer 1

Factor out 0.1t (t + 16)
t + 16 = 0
Subtract 16 from both sides
t = -16
After 16 years the income begins to decline