Find the center, foci, and vertices of the ellipse.16x2 + 9y2 = 144
A. center at (0, 0)
foci at (0, 4) and (3, 0)
vertices at (0, 16) and (9, 0)
B. center at (0, 0)
foci at (0, -4) and (0, 4)
vertices at (0, -16), (0, 16)
C. center at (0, 0)
foci at (0, - 
) and (0, 
)
vertices at (0, -4), (0, 4)
D. center at (0, 0)
foci at (- 
, 0) and (
, 0)
vertices at (-4, 0), (4, 0)
Answer: C
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Solve the equation for the indicated variable.5r + 1 = 9s for r
A. 
B. 
s - 1
C. 
s + 1
D. 9s - 
Write each whole number in expanded form.90,170
A. 9000 + 10 + 7 B. 90,000 + 1000 + 70 C. 9000 + 100 + 7 D. 90,000 + 100 + 70
For the following question(s), refer to the digraph below.
Suppose that the vertices of the digraph represent individuals and there is an arc going from vertex X to vertex Y if and only if X "likes" Y. Which of the following statements [A), B), C), or D)] is not true?
A. B likes E but E does not like B. B. B and C do not like each other. C. A likes B and E but does not like C or D. D. A and B like each other. E. all of these statements are true.
Rewrite the statement using mathematical symbols.The set consisting of the elements k and y is a proper subset of 
.
A. 
? 
B. 
? 
C. 
~ 
D. 
? 