Solve using matrices. 6x - y - 5z = 179x + 9y - 7z = 121 8x - 3y + z = 23
A. No Solution
B. (6, 2, 9)
C. (6, 9, 2)
D. (-6, 9, 12)
Answer: C
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Completely factor the difference of two squares.
?
?
A. 
B. 
C. 
D. 
E. 
Find y '.y = 
A. - 
- 2
B. - 
- 2
C. 
+ 2
D. 
+ 2
Suppose the wholesale price of a certain brand of medium-sized eggs p (in dollars/carton) is related to the weekly supply x (in thousands of cartons) by the equation 
.
?
If 25,000 cartons of eggs are available at the beginning of a certain week and the supply is falling at the rate of 1,000 cartons/week, at what rate is the wholesale price changing? (Hint: To find the value of p when 
, solve the supply equation for p when 
).
?
A. Increasing at the rate of 3.6 dollars/carton/wk
B. Increasing at the rate of 3.7 dollars/carton/wk
C. Dropping at the rate of 3.7 dollars/carton/wk
D. Dropping at the rate of 3.7 dollars/carton/wk
E. Dropping at the rate of 3.6 dollars/carton/wk
Provide an appropriate response.The demand equation for a certain product is p = 400 - 2q, where p is the price per unit (in dollars) for q units. If its supply equation is p = q + 100, then the consumers' surplus when market equilibrium is established is
A. $9000. B. $9500. C. $10,000. D. $10,500. E. $11,000.