Suppose you make a 4-minute local call using a calling card and are charged 7.6 cents. the cost of a local call varies directly with the length of the call. how much more will it cost to make a 30-minute local call?
-which quantity is the dependent quantity?
-how does the word "more" affect the method needed to solve the problem?

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