Your weekly cost (in dollars) to manufacture x cars and y trucks is
?
?
What is the marginal cost of a truck?
?
A. $6,000
B. $4,000
C. $2,000
D. $244,000
E. $246,000
Answer: B
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Provide an appropriate response.It can be shown that an ellipse with foci (c, 0) and (-c, 0), where the sum of the distances from any point 
of the ellipse to the two foci is 2a, has the equation 
+ 
= 1. Use this result to find an equation of an ellipse with foci (3, 0) and (-3, 0), where the sum of the distances from any point of the ellipse to the two foci is 12.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. x2 + y2 = 144
Provide an appropriate response.Use a graphing calculator to find all real roots of the equation. Round answers to two decimal places, if necessary: 
Fill in the blank(s) with the appropriate word(s).
Solve the system.
- 
= 
+ 
= 
A. {(-8, -7)}
B. 
C. {(7, -8)}
D. {(7, 8)}
Solve.The distance that an object falls when it is dropped is directly proportional to the square of the amount of time since it was dropped. An object falls 156.8 meters in 4 seconds. Find the distance the object falls in 5 seconds.
A. 245 meters B. 49 meters C. 20 meters D. 196 meters