Evaluate the polynomial.3x2 - 6x - 1, when x = 2
A. -7
B. -11
C. -5
D. -1
Answer: D
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Solve the problem.Carlos's grocery bill was $8.84. He gave the clerk a $20 bill. How much change should he receive?
A. $10.16 B. $11.15 C. $8.84 D. $11.16
Solve the equation.4x - (2x - 1) = 2
A. 
B. 
C. 
D. 
Find the vertex and axis of symmetry of the graph of the function.f(x) = -2x2 - 4x - 5
A. (1, -11) ; x = 1 B. (-1, -3) ; x = -1 C. (-2, -9) ; x = -2 D. (2, -21) ; x = 2
Find the expected value, the variance, and the standard deviation, when they exist, for the probability density function. Give an exact answer for the expected value and round the variance and standard deviation to four decimal places when appropriate.f(x) = 
A. 
; does not exist; does not exist
B. 
; 2.2168; does not exist
C. 
; 1.4889; does not exist
D. 
; 2.2168; 1.4889