Provide an appropriate response.The probability distribution for the random variable X is: 
What is the expected value of X?
A. 0.62
B. 0.26
C. 0.22
D. 0.50
Answer: A
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Solve the equation for solutions in the interval [0°, 360°).cos2 
= 1
A. ? = 0°, 45°, 90°, 135°, 180°, 225°, 270° B. ? = 0° C. ? = 0°, 90°, 180°, 270° D. ? = 33°, 57°, 123°, 147°, 213°, 237°, 303°, 327°
Find the real solutions of the equation.x4 - 5x2 + 4 = 0
A. {-4, 4} B. {-1, 1, -2, 2} C. {-5, 5} D. {-2, 2}
Describe what the given ordered pair represents.Let a be the total amount of money spent on advertising (in millions of dollars) by a national retail company at t years since 2000. What does the ordered pair (-4, 3.1) represent?
A. Over the last 4 years $3.1 million was spent on advertising. B. $3.1 million was spent on advertising in 1996. C. Since 1996 $3.1 million has been spent on advertising. D. $3.1 million was spent on advertising in 2004.
Solve the problem.A door operated security system on a new car is opened by pressing the correct combination of digits and letters on a door keypad. In this particular security system, there are 3 digits followed by 2 letters. How many possible combinations are possible for this system?
A. 260 combinations B. 26,000 combinations C. 676,000 combinations D. 67,600 combinations