Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
#1 2009-12-22 17:47:37
- soji
- Member
- Registered: 2009-12-22
- Posts: 1
The volume of a cube is increasing at the rate of 7 cubic centimetres
The volume of a cube is increasing at the rate of 7 cubic centimetres per second. How fast is the surface area increasing when the length of the edge is 12cm?
--------------------------------------------------------------------------------
Character is who you are when
Offline
#2 2009-12-22 18:27:37
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: The volume of a cube is increasing at the rate of 7 cubic centimetres
You have:
You want:
Using the chain rule,
The relations we need are:
When
cm^2/sOffline