adv functions

joe is building a wooden cylindrical storage box. the box will have a volume og 6pi m^3. for design purposes, the thick wood for the top and the bottom costs $6/m^2 and the thinner wood for the sides cost $5/m^2.

a)express the cost of the wood as a function of the radius. make sure to simplify the expression.

b) if hoe can afford to spend at most $72pi (~ $226.19) to make the storage box, what are the dimensions of the box?

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asked by samm
  1. cost=6*2PIr^2+5*2PIr*h

    volume=PIr^2*h or h=volume/PIr^2
    cost=12PIr^2+20PIr*6PI/PIr^2

  2. can you please explain how you got these equations?

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    posted by samm
  3. this is what i got:
    cost=6*2PIr^2+5*2PIr*h
    = 12PIr^2 + 10PIr*h
    = 12PIr^2 + 10PIr*(6/r^2)
    = 12PIr^2 + (60PI)/r

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    posted by samm

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