Find the indicated quantities for the appropriate arithmetic sequence.The population of a town was 27,500 at the beginning of 1970. If the population decreased 350 people per year, how many people lived in the town at the beginning of 1985?
A. 21,900
B. 22,600
C. 5250
D. 22,250
Answer: D
Mathematics
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Find the area of the specified region.Inside the lemniscate r2 = a2 sin 2?, a > 0
A. 0
B. a2
C. ?a2
D. 
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Find all specified roots.Square roots of i
A. -i, i
B. -1, 1
C. 
- 
i, - 
+ 
i
D. 
+ 
i, - 
- 
i
Mathematics
Assume the distribution is normal. Use the area of the normal curve to answer the question. Round to the nearest whole percent.The mean monthly income of trainees at a local mill is $1100 with a standard deviation of $150. Find the probability that a trainee earns less than $900 a month.
A. 19% B. 8% C. 90% D. 9%
Mathematics
Graph the ellipse. 5x2 + 3y2 + 60x - 24y + 213 = 0
A. 
B. 
C. 
D. 
Mathematics