Find an equation for the ellipse described.Foci at (±2, 0); x-intercepts are ±7
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
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Describe the domain of the function of three or more varables.f(x1, x2, ..., xn) = 
A. All points in ?4 that satisfiy x12 + x22 + ... + xn2 ? 0. B. All points in ?n except the origin (0, 0, ..., 0). C. All points in ?4 that satisfy x1 > 0, x2 > 0, ..., xn > 0. D. All points in ?n.
Solve the given problem by use of the sum of an infinite geometric series.A bicyclist traveling at 9 m/s then coast to a stop as the bicycle travels 0.98 as far each second as in the previous second. How far does the bicycle travel in coasting to a stop?
A. 475 m B. 450 m C. 400 m D. 460 m
Solve the problem.If an object is thrown upward with an initial velocity of 13 feet per second, its height is given by 
after time t seconds. What is its maximum height?
A. 172 ft B. 39 ft C. 169 ft D. 117 ft
Rationalize the denominator and simplify.
A. 
B. 
C. 
D. 