As part of a statistics project, a 6th grade teacher brings to class a container with 300 red marbles and 500 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 40 marbles from the container. Of the 40 marbles drawn, 16 are red.The data collection method can best be described as
A. a census.
B. a survey.
C. a controlled study.
D. a clinical study.
E. none of these
Answer: B
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Evaluate the improper integral or state that it is divergent.
A. 1.6667 B. 2.6667 C. 1.3333 D. Divergent
Solve by completing the square. Give exact solutions. Simplify radicals and reduce.x2 + 16x + 53 = 0
A. -8 ± 
B. 8 + 
C. -16 + 
D. 8 ± 
Multiply. Assume that all variables represent nonnegative real numbers.
A. 3m2 + 
B. 3m2 + m 
+ m 
+ 
C. 3m2 - m 
+ 3m 
- 
D. 3m2 + m 
+ 3m 
+ 
Solve the problem.A rescue cable attached to a helicopter weighs 2 lb/ft. A 160-lb man grabs the end of the rope and is pulled from the ocean into the helicopter. How much work is done in lifting the man if the helicopter is 30 ft above the water?
A. 6600 ft ? lb B. 1060 ft ? lb C. 4860 ft ? lb D. 5700 ft ? lb