9) You want to buy a backpack which costs $34.82. Now it is on sale of 30% off. What is the discount amount? What is the final cost with the discount?

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

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?

Math question.. plz me .. best answer all