Solve the problem.
-The polynomial function I(t) = -0.1t2 + 1.7t 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?
A) 17
B) 7.5
C) 8.5
D) 11.33

Question

Quizplus · Accepted Answer

The income begins to decline after reaching its maximum, which occurs at the vertex of the parabola. The vertex for a quadratic function in the form of ax^2 + bx + c is at t = -b/(2a). Here, a = -0.1 and b = 1.7, so t = -1.7/(2 * -0.1) = 8.5.

Solve the Problem. -The Polynomial Function I(t) = -0.1t2 + 1.7t Represents the 1.7t