Find the center, foci, and vertices of the ellipse.81x2 + y2 - 648x + 1,215 = 0
A. 
+ (y - 9)2 = 1
center: (9, 0); foci: (9, 
), (9, -4
); vertices:(9, 4),
(9, -4)
B. 
+ (y - 4)2 = 1
center: (4, 0); foci: (4, 4
), (4, -4
); vertices:(4, 9), (4, -9)
C. (x - 4)2 + 
= 1
center: (4, 0); foci: (4, 4), (4, -4
); vertices:(4, 9), (4, -9)
D. (x - 9)2 + 
= 1
center: (9, 0); foci: (9, 
), (9, -
); vertices:(9, 4), (9, -4)
Answer: C
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Provide an appropriate response.Is the set of integers closed under the operation of subtraction? Support your claim with an example.
What will be an ideal response?
Solve.28 ? v ? 9 = 16,380
A. v = 28 B. v = 252 C. v = 147,168 D. v = 65
Find the sum or difference. Write the answer in lowest terms.
- 
A. 
B. 
C. 
D. 2
Solve the problem.A ship leaves point A and travels directly north to point B. From point B, the ship then travels due east to point C. The magnitude of the vector from point A to point C is 128. Find the magnitude of the northern vector. Find the magnitude of the eastern vector.
A. 64 north; 64 east
B. 64
north; 64 east
C. 64 north; 64
east
D. 64
north; 64
east