Find the foci of the ellipse.
+ 
= 1
A. (0, -20), (0, 20)
B. (-20, 0), (20, 0)
C. (0, -15), (0, 15)
D. (-15, 0), (15, 0)
Answer: D
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Solve the problem.A plane is flying at a constant altitude of 6 miles and a constant speed of 400 miles per hour on a straight course that will take it directly over an observer on the ground. How fast is the angle of elevation of the observer's line of sight changing when the horizontal distance from her to the plane is d miles and the plane is moving away from her? Give your answer in radians per hour in terms of d.
A. - 
rads/hr
B. - 
rads/hr
C. - 
rads/hr
D. - 
rads/hr
Solve for the percentage in the problem. Round to the nearest tenth of a percent. % of 125 cartons is 18.9 cartons.
A. 661.4 B. 15.1 C. 0.2 D. 0.1
Graph the parabola.y = x2 - 4
A. 
B. 
C. 
D. 
Solve the problem.The sales of a new product (in items per month) can be approximated by 
, where t represents the number of months after the item first becomes available. Find the number of items sold per month 33 months after the item first becomes available.
A. 6400 items per month B. 3400 items per month C. 120,000 items per month D. 1000 items per month