Find the expected value.A fair coin is tossed three times, and a player wins $3 if 3 tails occur, wins $2 if 2 tails occur and loses $3 if no tails occur. If one tail occurs, no one wins. What is the expected value of the games?
A. $0.75
B. $2.00
C. -$3.00
D. $3.00
Answer: A
Mathematics
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The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using back-substitution.
A. ? B. {(15, 7)} C. {(16, 9)} D. {(17, 9)}
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Divide, if possible.
A. -7x B. -70 C. Not defined D. 0
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Write a numerical expression for the phrase and simplify it.Four-ninths of the difference between -9 and -27.
A. 4(9) [(-9) - (-27)]; 8
B. 
[(-9) - (-27)]; 8
C. 
+ [(-9) - (-27)]; 24
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Mathematics