At Time T = 0, a Seed Is Planted $f ( t ) = 0.3 t ^ { 2 } + 0.6 t + 0.5$

Multiple Choice

At time t = 0, a seed is planted. After t weeks, the height of the plant is given by $f ( t ) = 0.3 t ^ { 2 } + 0.6 t + 0.5$ inches. At what rate is the plant growing after 8 weeks?

A) 5.4 inches/week
B) 10.1 inches/week
C) 0.6t + 0.6 inches/week
D) 24.5 inches/week
E) none of these