Solve the problem.A continuous random variable X has PDF f(x) = 
x2(7 - x), 
Find E(X2).
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Graph.f(x) = -x2 - 3x - 9
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.A certain radioactive isotope has a half-life of approximately 1450 years. How many years, to the nearest whole number, would be required for a given amount of this isotope to decay to 35% of that amount?
A. 901 years B. 942.5 years C. 2196 years D. 2161 years
Mathematics
Graph the function.y = csc x
A. 
B. 
C. 
D. 
Mathematics
Use inductive reasoning to write the 6th, 7th and 12th terms of each sequence. Then write a formula for the nth term. Briefly explain your method.
Mathematics