Solve the problem.You travel a toll road that requires 45 cent tokens. If you purchase a special express sticker for $9, it is possible to use the express lane, for which tokens are only 30 cents. At which point is the express plan cheaper?
A. After 55 trips on the road
B. After 60 trips on the road
C. After 65 trips on the road
D. After 30 trips on the road
Answer: B
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Solve the linear equation.
+ x = 
+ 3
A. 
B. {5}
C. 
D. 
Solve the problem.The function A = Aoe-0.01155t models the amount in pounds of a particular radioactive material stored in a concrete vault, where t is the number of years since the material was put into the vault. If 700 pounds of the material are placed in the vault, how much time will need to pass for only 441 pounds to remain? Round to the nearest year.
A. 80 yr B. 40 yr C. 45 yr D. 50 yr
If one of the students is selected at random what is the probability he or she spent exactly 3 hours in the lab?
Use the following information to answer question, 24 students in an engineering class were asked to record the number of hours spent in a lab during a week. The results are listed below. 3, 10, 21, 14, 8, 5, 1, 4, 13, 7, 9, 6, 11, 10, 6, 7, 12, 16, 1 , 7, 14, 1, 11, 8
Solve the problem.Martha can rake the leaves in her yard in 8 hr. Her brother can do the job in 7 hr. How long will it take them to do the job working together?
A. 
hr
B. 
hr
C. 56 hr
D. 3
hr