Solve the problem.Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mean retirement age. Round your answer to the nearest tenth.
A. 57.1
B. 56.5
C. 58.0
D. 57.8
Answer: D
Mathematics
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Solve the problem.Find the center of mass of a thin triangular plate bounded by the coordinate axes and the line 
if 
.
A. 
= 
, 
= 
B. 
= 
, 
= 
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by x = y2 and the line x = 16, with density ?(x) = y2
A. 
= 
, 
= 0
B. 
= 
, 
= 0
C. 
= 
, 
= 0
D. 
= 0, 
= 
Mathematics
The argument has a true conclusion. Identify the argument as valid or invalid.No natural numbers are negative.-5 is negative. ? -5 is not a natural number.
A. Valid B. Invalid
Mathematics
Multiply.
? 
A. 
B. 10x
C. 7x
D. 
Mathematics