Posted by **Stephanie** on Tuesday, November 4, 2008 at 7:46pm.

Suppose you are designing a coffee creamer container that has a volume of 48.42 cubic inches. Use the surface area and volume of a cylinder to develope an eqn. relating radius r and surface area S.

¡Ç=pi=3.14

S=2¡Çr^2+2¡Çrh

V=¡Çhr^2

- Calculus-Optimal Form: need help... please -
**Damon**, Tuesday, November 4, 2008 at 8:04pm
Yes

S = 2 pi r^2 + 2 pi r h

V = pi r^2 h

so

h = 48.42 / pi r^2

so

S = 2 pi r^2 + 2 pi r (48.42 /pi r^2)

S = 2 pi r^2 + 96.84/r

- Calculus-Optimal Form: need help... please -
**Damon**, Tuesday, November 4, 2008 at 8:07pm
Now I am sure you want to find what r is best for this volume (uses the least metal for area)

dS/dr = 4 pi r - 96.84/r^2

= 0 for max or min of S

4 pi r^3 = 96.84

- Calculus-Optimal Form: need help... please -
**Stephanie**, Tuesday, November 4, 2008 at 8:46pm
thnx! :)

- optimal radius -
**Stephanie**, Tuesday, November 4, 2008 at 9:07pm
how do i find the optimal radius?

- Calculus-Optimal Form: need help... please -
**Damon**, Tuesday, November 4, 2008 at 9:58pm
We did, read my second answer. I knew that would be next.

4 pi r^3 = 96.84

## Answer this Question

## Related Questions

- Calculus - An open topped cylinder has a volume of 125 cubic inches. Express the...
- math - A cylindrical container has a volume of 226 cubic inches. the container ...
- Math - A cylinder has a height of 15 inches and a diameter of 12 inches. Use pi...
- Math - Are these correct 2a) For the cone, find the Lateral Surface Area in ...
- Math - Are these correct: 1a) Find the lateral surface area in square inches of ...
- Calculus - Find the radius, volume, and hieght of the right- circlar cylindar ...
- calc - the volume of a cylindrical tin can with a top and a bottom is to be 16*...
- math - A large cylinder has a volume of about 5,400 cubic cm. A small cylinder ...
- algebra/geometry please correct me - You need to make a soda can with a volume ...
- Math - How many cubic units are in the volume of a cylinder whose height is four...