Sprint would like to take customers from Pacific Bell, one of its competitors in a certain geographical area. Sprint would like to survey Pacific Bell's customers in order to find out which elements of its service are least satisfactory. Which of the following procedures would be most appropriate for obtaining a statistically unbiased sample?
?
A. Survey a random selection of people chosen from a list of Pacific Bell's customers.
B. Survey a random selection of people chosen from a list of Sprint's customers.
C. Place newspaper advertisements seeking survey participants and survey 100 people randomly chosen from those who respond.
D. Call local phone numbers and ask the person who answers if they are satisfied with their phone service.
Answer: A
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Match the system with the correct graph.x + y = 9x - y = -3
A. 
B. 
C. 
D. 
Determine any local or absolute extrema as indicated.g(x) = -|x + 4|
A. Local minimum: 0; absolute minimum: 0 B. Local maximum: 0; absolute maximum: 0 C. Local maximum: -4; absolute maximum: -4 D. Local maximum: 4; absolute maximum: 4
Use the numeric integration feature on your calculator to find the integral.
A. 0.88623 B. 0.05048 C. 0.00248 D. 0.00415
Danny and Stacey have gone from the swing to the slide at the park. The slide is inclined at an angle 
. Danny weighs 39.0 pounds. He is sitting in a cardboard box with a piece of wax paper on the bottom. Stacey is at the top of the slide holding on to the cardboard box. Find the magnitude of the force Stacey must pull with, in order to keep Danny from sliding down the slide. (We are assuming that the wax paper makes the slide into a frictionless surface, so that the only force
keeping Danny from sliding is the force with which Stacey pulls.)
?
?
A. 37.8 lb
B. 31.1 lb
C. 26.5 lb
D. 22.7 lb
E. 29.8 lb