Find an equation of the ellipse.An ellipse with y-intercepts ±8; foci at 
and 
.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
Mathematics
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Match the surface show below to the graph of its level curves.
A. 
B. 
C. 
D. 
Mathematics
Divide, if possible. Write the answer in simplest form.
÷ 
A. 
B. 
C. 
D. 
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Solve the problem.Two trains leave a train station at the same time. One travels north at 10 miles per hour. The other train travels south at 11 miles per hour. In how many hours will the two trains be 172.2 miles apart?
A. 4.1 hours B. 16.4 hours C. 8.7 hours D. 8.2 hours
Mathematics
Find the domain of the rational function.f(x) = 
A. domain of f: (-?, 0) ? (0, ?) B. domain of f: (-?, -7) ? (-7, -2) ? (-2, ?) C. domain of f: (-?, 2) ? (2, 7) ? (7, ?) D. domain of f: (-?, -3) ? (-3, 3) ? (3, ?)
Mathematics