Solve the problem.The value V, in dollars, of a shopkeeper's inventory software program is given by 
where t is the number of years since the shopkeeper first bought the program. After how many years is the value of the software $40?
A. 10 yr
B. 9 yr
C. 7 yr
D. 8 yr
Answer: D
Mathematics
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Simplify.
A. 
B. 4
C. 
D. 
Mathematics
Find the standard deviation.The management of an amusement park wanted to determine the amount of waiting time for the park's oldest roller coaster. The following data represents a random sample of waiting times in minutes (rounded to the nearest minute): 14 7 11 15 17 7 7 11 13What is the standard deviation? Round your answer to one decimal place.
A. 3.5 min B. 3.7 min C. 4.0 min D. 1.4 min
Mathematics
Use the following information to fill in the blank: 
18 tsp = ___ T
A. 54 B. 90 C. 3.6 D. 6
Mathematics
Simplify the expression. Write the result using positive exponents only.(x-3y5)-2
A. 
B. 
C. 
D. 
Mathematics