A combination lock has four wheels in a row. Each wheel has the digits from 0 to 9 on it. How many different combinations are th
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Answer:
When it's negative when it goes to the other side it becomes a positive.....
Y=(x-4)(x-1)
Make y 0 when your calculating for x
Make x 0 when your calculating for y
0=(x-4)(x-1)
Therefore x=4 or x=1
