Find the vertices and foci of the ellipse.196x2 + 81y2 = 15,876
A. Vertices: (0, ±14); Foci: (0, ±
)
B. Vertices: (±14, 0); Foci: (±
, 0)
C. Vertices: (±9, 0); Foci: (±
, 0)
D. Vertices: (0, ±9); Foci: (0, ±
)
Answer: A
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Solve.A rocket is shot straight up in the air from the ground at a rate of 70 feet per second. The rocket is tracked by a rangefinder that is 473 feet from the launch pad. Let d represent the distance from the rocket to the rangefinder and t represent the time, in seconds, since "blastoff". Express d as a function of t.
A. d(t) = 
B. d(t) = 473 + 70t2
C. d(t) = 
D. d(t) = 4732 + (70t)2
Expand the expression using the Binomial Theorem.
4
A. x4 - 12x3/2 + 54x - 
+ 
B. x4 - 12x5/2 + 54x - 
+ 
C. x4 + 
D. x4 - 
Divide.
A. 274 B. 0.000274 C. 0.00274 D. 2740
Simplify the expression. Assume that all variables are positive when they appear.
A. 9
- 11
B. 8
- 7
C. 10
+ 11
D. 9
- 7