Relations an functions

The stretch of a rubber band variesdirectly with the weight it supports. If the weight of a 3oz. stretches a certain rubber band 5in. what weight will stretch a rubber band 15in.? show all work
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2 Answers

  3              x

-----   =   ------

  5             15

cross multiply

5x = 3 * 15

x = 3 *15/5 = 3 * 3 = 9 oz.

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