SOLUTION: The function I(t) = -0.11 + 1.6t represents the yearly income (or loss) from real estate investment, where t is time in years. After what year does income begin to decline? Round t

Question 1158349: The function I(t) = -0.11 + 1.6t represents the yearly income (or loss) from real estate investment, where t is time in years. After what year does income begin to decline? Round the answer to the nearest tenth.
Found 2 solutions by greenestamps, MathLover1:
Answer by greenestamps(13200) (Show Source): You can put this solution on YOUR website!

Asking when at function value begins to decline when the function is linear makes on sense. A linear function is either constant, or always increasing, or always decreasing.

This function is always increasing....

Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
The function I(t) = -0.11 + 1.6t represents the yearly income=> I have noticed you have linear equation; there is no certain point where a line decline
I assume you have:
which is a parabola that have a maximum at vertex
so, write equation in vertex form:

....factor out
........complete square
.....

=> and => vertex is at (,)
a maximum will be at years, and after years income will begin to decline

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