The given function represents the cost of operating a high tech air filtration system C=80/(28-x) where the numerator represents the number of particles per million that are removed after one hour of operation and x is the number of hours. True or false; after 28 hours cost of operation is $0

i will pick c put check it over to be sure

step-by-step explanation:

i believe the correct answer is option 4.principalities were small territories that were run by russian rulers.

which statement correctly defines principalities in northern asia in the 1200s? principalities were small territories that were run by russian rulers.

hope i could ! : )

use distributive property on all like terms and change your signs if you have a double negative or if you have positive/negative