The graph of y = f(x) is given. Use the graph to find the function value.
Find f(-4).
A. -4
B. 1
C. None of these
D. 1.8
Answer: D
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Find the expected value of the random variable in the experiment.Three coins are tossed, and the number of tails is noted.
A. 2 B. 1.75 C. 1.5 D. 1
Find the square root.- 
A. -0.0072 B. 0.00020736 C. 0.12 D. -0.12
Solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable. -4x - 9y + 9z = -73 12x + 27y - 27z = 219-16x - 36y + 36z = -292
A. 
B. ?
C. 
D. {(7, 7, 2)}