Find the expected value for the random variable x having this probability function.
A. 16
B. 12.4
C. 13.2
D. 13
Answer: A
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In a school survey, students showed these preferences for instructional materials. Answer the question.
How many degrees are in the central angle for the "radio" sector?
A. 5° B. 9° C. 180° D. 18°
Match the function with its graph.1) y = sin (x)2) y = cos (x)3) y = -sin (x)4) y = -cos (x)A)B)
?
C)D)
?
A. 1C, 2A, 3B, 4D B. 1B, 2D, 3C, 4A C. 1A, 2D, 3C, 4B D. 1A, 2B, 3C, 4D
At a time t seconds after an object is tossed vertically upward, it reaches a height s in feet given by the equation:
?
?
What is the maximum height reached by the object?
?
A. 5 ft B. 400 ft C. 800 ft D. 10 ft E. 300 ft
The function f is one-to-one. Find its inverse.f(x) = (x - 7)3
A. f-1(x) = 
+ 7
B. f-1(x) = 
+ 343
C. f-1(x) = 
- 7
D. f-1(x) = 
+ 7