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
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Find the missing value and write a conclusion.20% of what number is 65 ?
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Show that f and g are inverses of each other by verifying that f(g(x)) = x = g(f(x)).f(x) = 
; g(x) = x2
What will be an ideal response?
Find all real numbers that satisfy the equation.cos x = - 
A. 
B. 
C. 
D. 
Use a quantifier to make the following true or false, as indicated, where x is a natural number.12x = 5x + 7x (make false)
A. More than one natural number x exists such that 12x = 5x + 7x. B. For every natural number x, 12x = 5x + 7x. C. There exists a natural number x such that 12x = 5x + 7x. D. There is no natural number x such that 12x = 5x + 7x.