Multimedia sales sales in the multimedia market hardware

Question

Question: Multimedia sales sales in the multimedia market (hardware and software) are approximated by the function

S(t) = -0.0094t⁴ + 0.1204t³ - 0.0868t² + 0.0195t + 3.3325          (0 ≤ t ≤ 10)

Where s(t) is measured in billions of dollars and t is measured in years, with t = 0 corresponding to 1990.

A. Plot the graph of s in the viewing window [0, 12] × [0, 25].

B. Find the inflection point of s and interpret your result.