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December 21, 2014

December 21, 2014

Posted by **Roger** on Tuesday, September 20, 2011 at 8:43am.

G(t)=-0.046t^3+0.915t^2+38.005 points, what is (dG/dt)when t=4? Round your answer to the nearest point per hour.

a. 50 points per hour

b. 3 points per hour

c. 5 points per hour

d. 7 points per hour

e. 20 points per hour

- calculus -
**Writeacher**, Tuesday, September 20, 2011 at 8:48amYour umpteen posts have been removed.

Once you write up**WHAT YOU THINK**, please re-post, and someone here will be happy to comment.

- calculus -
**Roger**, Tuesday, September 20, 2011 at 8:52amWHY ARE YOU DELETING MY POSTS?

- calculus -
**Writeacher**, Tuesday, September 20, 2011 at 9:00amTo quote one of our very good math and science tutors:

**"You will find here at Jiskha that long series of questions, posted with no evidence of effort or thought by the person posting, will not be answered. We will gladly respond to your future questions in which**__your thoughts__are included."

- calculus -
**Anonymous**, Tuesday, September 20, 2011 at 9:14amDerivative of t ^ 3 = 3 * t ^ 2

Derivative of t ^ 2 = 2 * t

Derivative of 38.005 = 0

dG / dt = - 0.046 * 3 * t ^ 2 + 0.915 * 2 t + 0 = - 0.138 * t ^ 2 + 1.83 * t

When t = 4

then :

dG / dt = - 0.138 * 4 ^ 2 + 1.83 * 4

dG / dt = - 0.138 * 16 + 7 . 32

dG / dt = - 2.208 + 7.32

dG / dt = 5.112

Rounded to the nearest point per hour :

dG / dt = 5 points per hour

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