A fraction equals zero if and only if its numerator equals zero. So, you have
In turn, a product is zero if either of the factors is zero:
And we have
Those values are compatible with the existence of the fraction (i.e. they don't nullify the denominator), so we can accept them as zeroes.
explanation: hope that
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The answer is 132 days
We know that the water drops an inch every 12 days.
now we need to get to 11 inches down.
12(days) x 11 = 132
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