Obtain an equivalent system by performing the stated elementary operation on the system.Replace the fourth equation by the sum of itself and 2 times the second equation
A. 
B. 
C. 
D. 
Answer: D
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Find the interval of convergence of the series.
A. 7 < x < 9 B. x < 12 C. 4 < x < 12 D. -12 < x < 12
Write the rational number in lowest terms.
A. 
B. 
C. 
D. 
Solve using the problem-solving strategy for systems of linear equations.The manager of a bulk foods establishment sells a trail mix for $8 per pound and premium cashews for $12 per pound. The manager wishes to make a 120-pound 
mixture that will sell for $9 per pound. How many pounds of each should be used?
A. 30 lb of trail mix 90 lb of cashews B. 60 lb of trail mix 60 lb of cashews C. 75 lb of trail mix 45 lb of cashews D. 90 lb of trail mix 30 lb of cashews
Solve the problem.A population of birds in a small county can be modeled by the polynomial 
where x = 1 corresponds to July 1, x = 2 to July 2, and so on. For what days does f estimate the population to be 8550?
A. July 12th B. July 14th C. July 13th D. July 11th