7. One of the fastest computers in the world can work 4.0 1010 operations per second. Which of the following represents this number in standard notation?
O A. 4,000,000,000
O B. 0.0000000004
OC. 0.00000000004
OD. 40,000,000,000

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