Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with vertices (0, ±7) and foci (0, ±3)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: B
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Evaluate.
A. 2!
B. 
C. 42
D. 
Identify equilibrium values and determine which are stable and which are unstable.
= (y + 3)(y + 2)
A. y = -3 is a stable equilibrium value and y = 2 is an unstable equilibrium. B. y = -2 is a stable equilibrium value and y = 3 is an unstable equilibrium. C. y = 3 is a stable equilibrium value and y = 2 is an unstable equilibrium. D. y = 2 is a stable equilibrium value and y = -3 is an unstable equilibrium.
Solve the problem.In a certain company, 77 employees were hired in the last 4 years. If this represents 44% of the company's current employees, then how many current employees does the company have?
A. 18 B. 175 C. 210 D. 140
Write interval notation for the following. Then graph the interval on a number line.The set of all numbers x such that -4 < x < 4
A. (-4, 4)
B. (-?, -4)
C. [-4, 4]
D. (4, ?)