Use Cramer's rule to solve the system. x + y + z + w = 7 3x - 2z + 5w = 11-4x + 3y + w = 4 -x - y - z - w = 6
A. Can't use Cramer's rule, D = 0
B. 
C. 
D. 
Answer: A
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Solve the problem.If a plot of land contains a rectangular array of 160 strawberry plants, how many rows are in the array if there are 40 plants in each row?
A. 30 B. 40 C. 9 D. 4
Solve the problem.Sketch a graph showing the mileage that a person is from home after x hours if that individual drives at 27.5 mph to a lake 55 miles away, stays at the lake 1.5 hours, and then returns home at a speed of 55 mph. 
A. 
B. 
C. 
Use Bayes' rule to find the indicated probability.Two stores sell a certain MP3 players. Store A has 34% of the sales, 5% of which are of defective items, and store B has 66% of the sales, 1% of which are of defective items. The difference in defective rates is due to different levels of pre-sale checking of the product. A person receives a defective item of this product as a gift. What is the probability it came from store B?
A. 0.275 B. 0.22 C. 0.5667 D. 0.7083
Identify the intervals where the function is changing as requested.Increasing
A. (-1, ?) B. (-2, 1) C. (-2, -1) or (3, ?) D. (-1, 3)