Solve the system of equations using Cramer's Rule if it is applicable. If Cramer's Rule is not applicable, say so.
A. x = 4, y = 2, z = 4; (4, 2, 4)
B. x = 5, y = 4, z = 2; (5, 4, 2)
C. x = 6, y = 2, z = 2; (6, 2, 2)
D. x = 5, y = -4, z = -2; (5, -4, -2)
Answer: B
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Solve the problem.Regrind, Inc. regrinds used typewriter platens. The cost per platen is $1.10. The cost (fixed cost plus variable cost) to regrind 100 platens is $500. Find the linear cost function to regrind platens. If reground platens sell for $10.70 each, how many must be reground and sold to break even?
A. C(x) = 1.10x + 390 break-even = 41 B. C(x) = 1.10x + 500 break-even = 53 C. C(x) = 1.10x + 390 break-even = 34 D. C(x) = 1.10x + 500 break-even = 43
Use a double-angle identity to find the exact value of the expression.
A. 
B. 
C. 
D. 
Suppose the time intervals in seconds between arrivals of successive cars at an expressway tollbooth during rush hour are exponentially distributed with associated probability density function 
. Find the probability that the average time interval between arrivals of successive cars is more than 9 sec. Round your answer to four decimal places.
?
A. 0.1929 B. ?0.5564 C. ?0.9403 D. ?0.2366 E. ?0.0498
Evaluate the determinant.
A. -2
B. 
C. 2
D. 0