Graph the ellipse and locate the foci.
+ 
= 1 
A. foci at (2
, 0) and (-2
, 0)
B. foci at (3, 0) and (-3, 0)
C. foci at (0, 7) and (0, -7)
D. foci at (0, 3) and (0, -3)
Answer: B
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Find the relative extrema of the function and classify each as a maximum or minimum.f(x) = x
A. Relative maximum: 
, relative minimum: 
B. Relative minimum: (0,0)
C. Relative minimum: 
, relative maximum: 
D. Relative maximum: 
Find the center and the radius of the circle.x2 + y2 - 14x - 18y = 0
A. (7, 9); r = 
B. (7, 0); r = 
C. (8, 9); r = 
D. (7, 9); r = 
Solve the problem.During the first day of an epidemic 8000 people get sick, during the second day 16,000 people get sick, and so on with the number of people getting sick increasing by 8000 each day. The epidemic peaks after 30 days with 8000 fewer people getting sick on the 31st day than on the 30th day, and so forth. What is the total number of people who get sick?
A. 7,200,000 B. 6,960,000 C. 7,440,000 D. 7,320,000
Use a graphing calculator to solve the system of equations. Round your solutions to one decimal place.2.2x + 2.1y - 4.1z = 1.54.0x - 6.8y + 1.2z = -3.03.8x + 4.0y + 4.0z = 10.9
A. (1.9, 2.2, 1.4) B. (0.9, 1.1, 0.7) C. (3.8, 4.5, 2.8) D. (0.5, 0.6, 0.4)