Evaluate. If necessary, find common denominators and simplify completely.5
+ 1
A. 7
B. 6
C. 6
D. 6
Answer: A
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Perform the indicated operations.
A. 
B. 
C. 4
D. 
Solve the problem.A data set consists of 542 lightbulbs. Over a long period of time, the lifetimes of those lightbulbs have been tested. It has been found that the mean and standard deviation are known and the lifetimes of the bulbs are normally distributed. What number of bulbs within this data set will have lifetimes that lie between the mean and two standard deviations below the mean? Round your answer to the nearest whole number.
A. 185 B. 268 C. 74 D. 259
Perform the indicated operation and write the answer in lowest terms. 
÷ 
A. 
B. 
C. 
D. 
Solve the discount problem.Peggy received a $21.80 discount on an office chair that normally sells for $109.00. Find the discount rate.
A. 1% B. 80% C. 20% D. 8%