The population aged 65 years old and older (in millions) from 2000 to 2050 is projected to be
?
?
where 
is measured in decades, with 
corresponding to 2000. What will be the average population aged 65 years and older over the years from 2000 to 2020?
(Hint: The average population is given by 
. Multiply the integrand by 
and then use the method of substitution.) Round your answer to one decimal place.
?
A. 180.7 million
B. 43.8 million
C. 57.5 million
D. 87.7 million
E. 33.1 million
Answer: B
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A. 
B. 
C. ?
D. 
Rewrite the fractions as equivalent fractions with the given LCD.
and 
LCD: 24
A. 
; 
B. 
; 
C. 
; 
D. 
; 
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A. 
B. 
C. 
D. 
Match the story with the correct figure.The height of an animal as a function of time.
A. 
B. 
C. 
D. 