)  ​"Casting out​ nines" is a computation check method involving remainders. This method involves dividing each number on both sides of the equation by​ 9, replacing each number with its remainder after being divided by​ 9, and redoing the​ calculations, dividing any necessary numbers by 9 again after the calculations are complete. If the original computation was​ correct, then the new computation will be correct. If the new computation is​ wrong, then the original computation was wrong. Use the method of casting out nines to show that the following computations are wrong.   a. 99+25=524 b. 11,399−14=11,345 c. 99•26=2575

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