Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.cos ? = 
, 0 < ? < 
Find sin (2?).
A. 
B. 
C. 
D. 
Answer: C
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Tessa won the lottery for $2,500,000 but due to a change in state laws she will not be able to collect it for three years. Ralph is willing to give her a lump sum today in return for the payment in three years. If current interest rates are 14% per year, how much will Tessa receive today?
A. $1,687,430 B. $5,804,080 C. $2,500,000 D. $3,703,860
Lifespan developmentalists typically focus on which of the following?
A. a particular family B. a particular age range C. a particular town/city D. a particular country
What type of research is designed to discover causal relationships between various factors?
A. correlational B. hypothetical C. experimental D. theoretical
Mary is investigating factors related to alcohol use among college students, so she lives in a college dormitory for a month to observe students and conduct in-depth interviews with them. This is an example of what type of research?
A. experimental B. ethnography C. representative research D. survey research