Which situation is an example of an observational study? O A. Finding the number of red jellybeans placed in an average jar of
O B. Having customers fill out a questionnaire about their favorite
O c. Dividing a class into thirds, giving each third a different amount of
O D. Placing different groups of people in different colored rooms and
jellybeans by counting
brand of toothpaste
time to read, and then testing comprehension
recording their mood

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.

Tatiana wants to give friendship bracelets to her 32 classmates. she already has 5 bracelets, and she can buy more bracelets in packages of 4. write an inequality to determine the number of packages, p, tatiana could buy to have enough bracelets.