Solve.Martha can rake the leaves in her yard in 3 hours. Her younger brother can do the job in 4 hours. How long will it take them to do the job if they work together?
A. 
hr
B. 
hr
C. 12 hr
D. 4 hr
Answer: B
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Solve the problem.You have money in an account at 5% interest, compounded weekly. To the nearest year, how long will it take for your money to triple?
A. 18 years B. 31 years C. 13 years D. 22 years
Find the domain of the function 
.
What will be an ideal response?
Find the value of the probability of the standard normal variable Z. Round your answer to four decimal places.
?
?
A. 0.8522 B. ?0.4728 C. ?0.1013 D. ?0.2266 E. ?0.3717
Solve. Round to the nearest whole if necessary.One day 16 office workers were sick with the flu. If this were 16% of the total number of office workers, how many office workers were there altogether?
A. 256 office workers B. 100 office workers C. 1000 office workers D. 2560 office workers