Express as a single logarithm and, if possible, simplify.ln z - 3[2ln (z - 4) - ln (z + 4)]
A. ln 
B. ln 
C. ln 
D. ln 
Answer: B
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Find an equation of variation for the given situation.y varies inversely as x and y = 80 when x = 
A. y = 
B. y = 
C. y = 
D. y = 
Use Newton's Law of Cooling, T = C + (T0 - C)ekt, to solve the problemA lasagna removed from the oven has a temperature of 430°F. It is left sitting in a room that has a temperature of 75°F. After 6 minutes, the temperature of the lasagna is 310°F. Use Newton's Law of Cooling to find a model for the temperature of the lasagna, T, after t minutes.
A. T = 75 + 355e-0.0688t B. T = 75 + 355e-0.0764t C. T = 75 + 235e-0.0764t D. T = 310 + 355e-0.0688t
Solve.A boat goes 360 miles downstream in the same time it can go 300 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.
A. 44 mph B. 66 mph C. 40 mph D. 48 mph
Use addition to check the subtraction problem. If the answer is incorrect, find the correct answer.
2333
A. Incorrect; should be 2232 B. Incorrect; should be 2342 C. Incorrect; should be 2332 D. Correct