Identify the following as an experiment or an observational study.Twenty volunteers suffering from sleep apnea are randomly divided into two groups. One group receives a new medication to reduce snoring while the other group receives a placebo. Levels of sleep apnea for each person are monitored for a month.
A. Observational study
B. Experiment
Answer: B
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Solve.A company that manufactures outdoor rocking chairs makes a daily profit p according to the equation 
where p is measured in dollars and x is the number of rocking chairs made per day. Find the number of rocking chairs that must be made each day to produce a zero profit for the company. Round your answer to the nearest whole number.
A. 2041 rocking chairs or 2459 rocking chairs per day B. 20 rocking chairs or 25 rocking chairs per day C. 45 rocking chairs or 50 rocking chairs per day D. 25 rocking chairs per day
Find the identical expression for the following.
?
?
A. 
B. 
C. 
D. 
E. 
Solve the problem using matrices.Ron attends a cocktail party (with his graphing calculator in his pocket). He wants to limit his food intake to 
protein, 103 g fat, and 153 g carbohydrate. According to the health conscious hostess, the marinated mushroom caps have 3 g protein, 5 g fat, and 9 g carbohydrate; the spicy meatballs have 14 g protein, 7 g fat, and 15 g carbohydrate; and the deviled eggs have 13 g protein, 15 g fat, and 6 g carbohydrate. How many of each snack can he eat to obtain his goal?
A. 9 mushrooms, 4 meatballs, 2 eggs B. 4 mushrooms, 2 meatballs, 9 eggs C. 10 mushrooms, 5 meatballs, 3 eggs D. 2 mushrooms, 9 meatballs, 4 eggs
Determine the order of the matrix.
A. 2 × 2 B. 1 C. 2 D. 4