Add or subtract as indicated.11
- 15
A. 26
B. -4
C. -25
D. 3
Answer: B
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Identify the curve as simple, closed, both, or neither.
A. Simple B. Neither C. Closed D. Both
Graph the solution of the system.
A. 
B. 
C. 
D. 
Write each mixed number as an improper fraction.11
A. 
B. 
C. 
D. 
The number of persons aged 18-64 receiving disability benefits through Social Security, the Supplemental Security income, or both, from 1990 through 2000 is approximated by the function 
, where 
is measured in units of a million and t is measured in years, with
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?
Compute 
. Round your answer to five decimal places.
?
A. 
million
million per year
million per year in the second power
?
B.
million
million per year
million per year in the second power
?
C.
million
million per year
million per year in the second power
?
D.
million
million per year
million per year in the second power
?
E.
million
million per year
million per year in the second power
?