Jennifer can clean her room in 2 hours, while john can clean the same room in 5 hours. how many hours would it take for them to clean the room together?
7
10
seven tenths
ten sevenths
i think the answer is tenth sevenths but im not sure!asap

Polynomial that can be factored as (3x-4)(3x+4)

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0