Find an equation for the ellipse described.Vertices at (-8, 6) and (12, 6); focus at (10, 6)
A. 
+ 
= 1
B. 
- 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
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Identify the row operation that produces the resulting matrix.
? 
A. (-1)R2 ? R2 B. R1 + (-1)R2 ? R2 C. (-1)R1 + R2 ? R2 D. R1 + (-1)R2 ? R1
Simplify the expression.(-2z2)(4z3)
A. 256z5 B. -8z6 C. -8z5 D. 8z6
Suppose that the total cost function, in dollars, for a certain commodity is given by 
, where x is the number of units produced. Find the instantaneous rate of change of the average cost 
for any level of
production.
?
A. 
B. 
C. 
D. 
E. 
Use the vertex to solve the application problem.An object is launched vertically in the air at 40 feet per second from a platform 50 feet above the ground. The height of the object above the ground (in feet) t seconds after launch is given by 
How long does it take the object to reach its maximum height? What is the object's maximum height?
A. 2.5 sec; 75 ft B. 1.25 sec; 50 ft C. 2.5 sec; 50 ft D. 1.25 sec; 75 ft