The number of Americans aged 45 to 54 (which stood at 25 million at the beginning of 1990) grew at the rate of
?
?
million people/year, 
years from the beginning of 1990. How many Americans aged 45 to 54 were added to the population between 1990 and the year 1999? Give your answer to one decimal place.
?
A. 28.0 million
B. 26.5 million
C. 27.7 million
D. 28.5 million
Answer: C
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A. All real numbers except y < -1 B. All real numbers except y > -1 C. All real numbers except y = -1 D. All real numbers
Identify the conic that the polar equation represents. Also, give the position of the directrix.r = 
A. ellipse, directrix perpendicular to the polar axis 2 left of the pole B. ellipse, directrix perpendicular to the polar axis 2 right of the pole C. ellipse, directrix parallel to the polar axis 2 below the pole D. ellipse, directrix parallel to the polar axis 2 above the pole
Find the indefinite integral 
and check your result by differentiation.
?
A. 
B. 
C. 
D. 
E. 
Multiply.4a4b3c ? 8bc5d2
A. 32a4b3c5d2 B. 32a4b4c6d2 C. 12a4b4c6d2 D. 32a4b2c4d2