Find the expected value for the random variable x having this probability function.
A. 8.4
B. 8
C. 10
D. 9.2
Answer: A
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Provide an appropriate response.Find the total force against the surface of a tank full of liquid of weight density 3 for a tank in the shape of a hemisphere of radius 2 with a flat base.
A. 48? B. 16? C. 96? D. 24?
Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. How fast is the object accelerating when it is accelerating the fastest?
A. A
cm/sec2
B. A cm/sec2
C. 
cm/sec2
D. A2 cm/sec2
Provide an appropriate response.17 + 7 = C is a statement of equality.
A. True B. False
Solve the problem.When making a long distance call from a certain pay phone, the first three minutes of a call cost $1.95. After that, each additional minute or portion of a minute of that call costs $0.50. Use an inequality to find the number of minutes one can call long distance for $11.95.
A. 20 minutes or fewer B. 6 minutes or fewer C. 24 minutes or fewer D. 23 minutes or fewer