Which expression is the best estimate of the product of StartFraction 7 over 8 EndFraction and 8 and StartFraction 1 over 10 EndFraction?

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

Whit h equation best represents this situation the number 98 increased by an unknown number equal to 120

Ithink i know it but i want to be sure so can you me out ?