Identify the triangle PQR as an isosceles (two sides of equal length), equilateral (three sides of equal length), or scalene (three sides of different lengths) triangle.P
R
A. Isosceles
B. Scalene
C. Right
D. Equilateral
Answer: A
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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
?
Collect like terms.
x + 
y - 
x - 
y + 19
A. 
x + 
y + 19
B. 
x + 
y + 19
C. 
x + 
y + 19
D. 
x + 
y + 19
Perform the indicated division or state that the expression is undefined.
A. 0.4 B. -4 C. 4 D. -0.4
Evaluate the integral.
A. 
B. 
C. 12
D. 36