6. (matched problem 8, p. 142) COST ANALYSIS: It costs a pretzel vendor $20 a day to rent a cart and $0.75 for each pretzel.
a) Find the cost of selling x pretzels in one day,
b) What is the cost of selling 150 pretzels in one day.
c) If the daily cost is $275, how many pretzels were sold that day?

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