Use the definition to find an expression for the instantaneous velocity of an object moving with rectilinear motion according to the given function relating s (in ft) and t (in s).s = 
+ 
A. 
- 
B. - 
+ 
C. - 
- 
D. - 
- 
Answer: D
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Find the center, foci, and vertices of the ellipse.3x2 + 4y2 - 36x + 24y + 132 = 0
A. 
+ 
= 1
center: (-6, 3); foci: (-5, 3), (-7, 3); vertices: (-8, 3), (-4, 3)
B. 
+ 
= 1
center: (6, -3); foci: (7, -3), (5, -3); vertices: (8, -3), (4, -3)
C. 
+ 
= 1
center: (-6, 3); foci: (-5, 3), (-7, 3); vertices: (-8, 3), (-4, 3)
D. 
+ 
= 1
center: (6, -3); foci: (7, -3), (5, -3); vertices: (8, -3), (4, -3)
Solve the problem.In how many ways can 8 people be chosen and arranged in a straight line, if there are 12 people from whom to choose?
A. 11,880 B. 23,760 C. 19,958,400 D. 96
Solve the system. x - y + 5z = 272x + z = 5 x + 4y + z = -3
A. {(0, -2, 5)} B. {(5, -2, 0)} C. ? D. {(5, 0, -2)}
Determine if the graph of the function is concave up or concave down.y = x2 - 4x + 4
A. Concave down B. Concave up