Sergio's internet provider charges its customers $9 per month plus 4¢ per minute of on-line usage. sergio received a bill from the provider covering a period and was charged a total of $81.40. how many minutes did he spend on-line during that period? (round to the nearest whole minute, if necessary.)

Ten members of balin's soccer team ran warm ups for practice. each member ran the same distance. their combined distance was 5/6 of a mile. to find the distance that each member ran, balin wrote the expression below.

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

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.