Perform the indicated row operations on the following matrix. 
(-2)R1 + R2 ? R2
A. 
B. 
C. 
D. 
Answer: D
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Multiply.
A. 477,044 B. 477,104 C. 477,094 D. 477,204
Solve the problem.The natural resources of an island limit the growth of the population to a limiting value of 2573. The population of the island is given by the logistic equation 
where t is the number of years after 1980. What is the population of the island in 1985?
A. 1374 B. 623 C. 1527 D. 1451
Solve the problem.John owns a hotdog stand. He has found that his profit is represented by the equation 
, where x is the number of hotdogs. What is the most he can earn?
A. $22 B. $80 C. $44 D. $12
Solve the problem.Two recording devices are set 3600 feet apart, with the device at point A to the west of the device at point B. At a point on a line between the devices, 200 feet from point B, a small amount of explosive is detonated. The recording devices record the time the sound reaches each one. How far directly north of site B should a second explosion be done so that the measured time difference recorded by the devices is the same as that for the first detonation?
A. 1788.85 feet B. 7375.64 feet C. 1241.22 feet D. 425 feet