Find the least common denominator.
+ 
A. t
B. 27
C. t - 2
D. t(t - 2)
Answer: D
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Simplify the expression. If any variables exist, assume that they are positive.8
- 6m2p
A. 2
B. 14mp2
C. 2m2p
D. Cannot be simplified
Write the rate as a unit rate.In a region, the total number of students enrolled in public schools in a recent year was 455,057. At the same time, there were 24,432 public school teachers. Write a unit rate in students per teacher. Round to the nearest whole student.
A. 20 students/teacher B. 21 students/teacher C. 18 students/teacher D. 19 students/teacher
Solve the linear programming problem.A doctor has told a sick patient to take vitamin pills. The patient needs at least 6 units of vitamin A and at least 6 units of vitamin B. The red vitamin pills cost 
each and contain 1 unit of A and 2 units of B. The blue vitamin pills cost 
each and contain 2 units of A and 1 unit of B. To avoid indigestion, the patient should take no more than 4 red pills and no more than 7 blue pills. How many pills should the patient take each day to minimize costs?
A. 4 red and 7 blue B. 2 red and 2 blue C. 0 red and 6 blue D. 4 red and 1 blue
Statistical Abstracts, (117th ed.), reports average travel time to work for commuters in the New England states to be (to the nearest minute):
18 21 17 25 18 21 ? What is the median of these commuting times? Round your answer to one decimal place, if necessary. a. 18 b. 19.5 c. 17 d. 21 e. 0