Solve the problem.The annual rainfall in Maine is a random variable with probability density function defined by 
for x in 
Find the mean annual rainfall.
A. 3.000
B. 3.360
C. 2.994
D. 3.194
Answer: D
Mathematics
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Solve the problem.Find the radius of gyration about the x-axis of a lamina in the first quadrant bounded by the coordinate axes and the curve 
if 
.
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Mathematics
Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.
+ 
+ 
+ . . . + 
A. 
B. 
C. 
D. 
Mathematics
Provide an appropriate response.Solve the system of equations using the addition method: 4x - y = 9 -x + y = -3
A. x = -1, y = 2 B. x = 2, y = -1 C. x = -1, y = -5 D. x = 5, y = 2
Mathematics
Solve the system by the method of substitution.
?
?
?
A. 
B. (1, 3)
C. 
D. 
E. (-1, 3)
Mathematics