An ultra-low flush toilet uses 1.6 gallons every time it is flushed. What is the pattern that describes the total water used aft
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You could do all of the work with the multiplying, but what I think it wants you to see is that you can divide like numbers by subtracting exponents.
so if we did that we would get
this in turn would give us 4 x -9 x -5 = 180