1. Nov 5, 2012 #1

   nukeman

   

   1. The problem statement, all variables and given/known data
   
   r/h = 4/6
   
   This turns into: r = 2h/3
   
   How, can someone please refresh me? I am doing a related rates problem, and I for this! :(
   
   
   2. Relevant equations
   
   
   
   3. The attempt at a solution

    

   nukeman, Nov 5, 2012
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3. Nov 5, 2012 #2

   dextercioby

   

   Science Advisor

   Homework Helper

   Insights Author

   Isn't 4/6 = 2/3 ? (Everything is written in basis 10).

    

   dextercioby, Nov 5, 2012
4. Nov 5, 2012 #3

   Mark44

   

   Insights Author

   Staff: Mentor

   r/h = 4/6 = 2/3
   
   Now multiply both sides of this equation by h.

    

   Mark44, Nov 5, 2012
5. Nov 5, 2012 #4

   nukeman

   

   4/6 * x = 2x/3x ?
   
   Why is just 2x/3 ?

    

   nukeman, Nov 5, 2012
6. Nov 5, 2012 #5

   dextercioby

   

   Science Advisor

   Homework Helper

   Insights Author

   The multiplication affects only the numerator. Think about it as (6/4)x5 = (6:4)x 5 = 6:4x5 = 6x5:4 = 30:4 = 7.5

    

   Last edited: Nov 5, 2012

   dextercioby, Nov 5, 2012
7. Nov 5, 2012 #6

   HallsofIvy

   

   Science Advisor

   If you are doing things involving "related rates" and Calculus, I think we have right to assume that you can do arithmetic! 4/6= (2*2)/(2*3)= 2/3!!!

    

   HallsofIvy, Nov 5, 2012
8. Nov 5, 2012 #7

   Mark44

   

   Insights Author

   Staff: Mentor

   And if this assumption by us is incorrect, then you are going to have a very difficult time in calculus.

    

   Mark44, Nov 5, 2012

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