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

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equation Customizable Word Problems -> SOLUTION: At time t = 0, a seed is planted. After t weeks, the height of the plant is given by f(t) = 0.3t^2 + 0.6t + 0.5 inches. At what rate is the plant growing after 8 weeks?      Log On


   

Question 1114791: At time t = 0, a seed is planted. After t weeks, the height of the plant is given by f(t) = 0.3t^2 + 0.6t + 0.5 inches. At what rate is the plant growing after 8 weeks?
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
How does f(t) change with t?

df%2Fdt=%28d%2Fdt%29%280.3t%5E2%2B0.6t%2B0.5%29

df%2Fdt=0.6t%2B0.6


Growth rate in inches per week,
0.6t%2B0.6

and you want to evaluate that for t=8.