The answer is 
.
The fraction is:
Let's rewrite it:
Since
,
then:
***
***
______
The fraction is:
Let's rewrite it:
Since
then:
***
***
______
Which expression can be used to find the sum of the polynomials? (9 – 3x2) + (–8x2 + 4x + 5)
2 answers:
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If Ann cleans in 12 hours then she cleans 
of the apartment per hour. Similarly Liz cleans 
of the appartment per hour. So together then can clean 
of the apartment for hour. Therefor it will take them 
hours to clean.
The general formula
can be used as a check if needed.
The general formula