Posted by Ass11 on Thursday, November 24, 2011 at 1:53am.
UBC parcel post regulations states that packages must have length plus girth of no more than 84 inches. Find the dimension of the cylindrical package of greatest volume that is mailable by parcel post. What is the greatest volume? Make a sketch to indicate your variables.
I have no idea where to start with this question. Please show work so I can follow along :)
Thanks in advance!

Calculus  Optimization  MathMate, Thursday, November 24, 2011 at 7:31am
Let
L=length, then
girth=84L=2*radius=2R, or
R=(84L)/2
Volume, V = πR²L
Express V in terms of L using R=(84L)/2
Equate dV/dL=0 and solve for L.

Calculus  Optimization  Yenn, Wednesday, December 12, 2012 at 10:14pm
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A parcel service will only accept packages with a length of no more than 96 inches and length plus girth of no more than 156 inches. (See the figure below.) Assuming that the front face of the package (as shown in the figure) is square, what is the largest volume package that the parcel service will accept?

Calculus  Optimization  Sarah, Wednesday, July 23, 2014 at 8:34pm
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