Find the expected value.Suppose that 1,000 tickets are sold for a raffle that has the following prizes: one $300 prize, two $100 prizes, and one hundred $1 prizes. What is expected value of a ticket?
A. $300
B. $0.60
C. $1
D. $100
Answer: B
Mathematics
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Solve the problem.The number of years since two independently evolving languages split off from a common ancestral language is approximated by 
where r is the percent of words from the ancestral language common to both languages now. What is 
A. 2154 years B. 215 years C. 2087 years D. 20,872 years
Mathematics
Provide an appropriate response.Which of the following is NOT a name for ?ABC? 
A. ?CBA B. ?B C. ?AaC D. ?a
Mathematics
Find the difference.-10.3 - (-6.9)
A. 3.4 B. 17.2 C. -3.4 D. -17.2
Mathematics
Find the exact value of the expression.cot-1
A. 
B. 
C. 
D. 
Mathematics