Question 253196
 By how much does r - s exceed s - r ? 
a (r-s)/(s-r) b 2(r-s) c -2 d 2(s-r) e -1
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Your Problem:
(r-s)-(s-r) = r-s-s+r = 2r-2s = 2(r-s)
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Cheers,
Stan H.