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posted by Anonymous Sunday, September 5, 2010 at 4:53pm.

find r from the formula e= ir when e= 20 and i = 4

plug in the numbers so 20=4r then divide by 4 20/4 so 5=r

e= ir 20 = 4r 20/4 = r 5 = r Substitute 5 for r to prove this equation. 20 = 4 * 5 20 = 20 Right.

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