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July 30, 2014

July 30, 2014

Posted by **Shin** on Tuesday, February 11, 2014 at 8:33am.

- Math (Variation) -
**Reiny**, Tuesday, February 11, 2014 at 10:14amcost = k r^2

when r = 6, cost = 148

148 = k(36)

k = 37/9

cost = (37/9) r^2

so when r = 11

cost = (37/9)(121) = 497.44

or

cost1/cost2 = r1^2/r2^2

148/cost2 = 36/121

36cost2 = 148(121)

cost = 148(121)/36 = 497.44

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