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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Factor completely, or state that the polynomial is prime.x2 - 8x + 7
A. (x - 1)(x - 7) B. (x + 1)(x + 1) C. (x + 1)(x - 7) D. prime
Identify the row operation that produces the resulting matrix.
? 
A. (-1)R2 ? R2 B. R1 + (-1)R2 ? R2 C. (-1)R1 + R2 ? R2 D. R1 + (-1)R2 ? R1
Find the center, transverse axis, vertices, foci, and the equations of the asymptotes of the hyperbola.
- 
= 1
A. center: (0, 0)
transverse axis: x = 0
vertices: (0, -9) and (0, 9)
foci: (-
, 0) and (
, 0)
asymptotes: y = - 
x and y = 
x
B. center: (0, 0)
transverse axis: y = 0
vertices: (-2, 0) and (2, 0)
foci: (-
, 0) and (
, 0)
asymptotes: y = - 
x and y = 
x
C. center:(0, 0)
transverse axis: y = 0
vertices: (-9, 0) and (9, 0)
foci: (-
, 0) and (
, 0)
asymptotes: y = - 
x and y = 
x
D. center: (0, 0)
transverse axis: y = 0
vertices: (-9, 0) and (9, 0)
foci: (-2, 0) and (2, 0)
asymptotes: y = - 
x and y = 
x
Determine whether or not the graph represents a function.
A. function B. not a function