It takes an older pump twice as long to drain a certain pool as it does a newer pump. Working together, it takes the two pumps
2 answers:
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You can factor -80 as
So, we have
The square root of a product is the product of the square roots:
Since and
, we have
The easiest way is if it doesn't need to be simplified. Multiply -2.105 by 
. You get the fraction 
. While this is technically the answer, you can simplify this down to 
. Because 421 is a prime number, this can not be simplified any further. Therefore, the solution is .
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