math
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A local photocopying store advertises as follows. " We charge 9 cents per copy for 150 copies or less, 6 cents per copy for each copy over 150 but less than 210 , and 3 cents per copy for each copy 210 and above. " Let x be the number of copies ordered and C(x) be the cost of the job (in cents ).
 If x \leq 150, the cost of the copies is C(x) =
 If 150 < x < 210, the cost of the copies is C(x) =
 If x \geq 210, the cost of the copies is C(x) =
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