Find an equation for the ellipse described.Foci at (-3, 4) and (-3, -2); length of major axis is 10
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: C
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Find the area of the specified region.Inside the lemniscate r2 = a2 sin 2?, a > 0
A. ?a2
B. 
C. 0
D. a2
Solve the problem.A company makes a very durable product. It sells 20,000 in the first year, but will have diminishing sales due to the product's durability, so that each year it can expect to sell only seventy-five percent of the quantity it will have sold the year before. How many products can the company expect to eventually sell?
A. 80,000 products B. 35,000 products C. 26,667 products D. 40,000 products
Sketch a typical level surface for the function.f(x, y, z) = x - y2 - z2
A. 
B. 
C. 
D. 
Solve the problem.The sales of a new model of notebook computer are approximated by 
, where x represents the number of months the computer has been on the market and S represents sales in thousands of dollars. In how many months will the sales reach $1,500,000?
A. 13 months B. 17 months C. 10 months D. 20 months