The answer is 60 for the second question i am sorry i do not know the first
Hello!
Robin can clean 72 rooms in 6 days. How many rooms can Robin clean in 9 days?
We have a proportional magnitude (directly proportional), if we increase the number of days for cleaning, obviously we will have more rooms cleaned, then:
clean rooms __________ days
72 ----------------------------------- 6
y ------------------------------------- 9
![\dfrac{72}{y} = \dfrac{6}{9}](https://tex.z-dn.net/?f=%5Cdfrac%7B72%7D%7By%7D%20%3D%20%5Cdfrac%7B6%7D%7B9%7D)
multiply the means by the extremes
![6*y = 72*9](https://tex.z-dn.net/?f=6%2Ay%20%3D%2072%2A9)
![6\:y = 648](https://tex.z-dn.net/?f=6%5C%3Ay%20%3D%20648)
![y = \dfrac{648}{6}](https://tex.z-dn.net/?f=y%20%3D%20%5Cdfrac%7B648%7D%7B6%7D)
![\boxed{\boxed{y = 108}}\Longleftarrow(clean\:rooms)\end{array}}\qquad\checkmark](https://tex.z-dn.net/?f=%5Cboxed%7B%5Cboxed%7By%20%3D%20108%7D%7D%5CLongleftarrow%28clean%5C%3Arooms%29%5Cend%7Barray%7D%7D%5Cqquad%5Ccheckmark)
Answer:
108 clean rooms in 9 days
________________________
I Hope this helps, greetings ... Dexteright02! =)
=36/35
Change the denominator to 35
Then just minus
Your factored answer will be
(3x-4y) (x-5y)
hope this helps