Identify the interval where f is increasing or decreasing, as indicated. Express your answer in interval notation.f(x) = -2x2 + 8x; increasing
A. [-2, ?)
B. (-?, 2]
C. [2, ?)
D. (-?, -2]
Answer: B
Mathematics
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Use the Gauss-Jordan method to find A-1, if it exists.A = 
A. 
B. 
C. 
D. Does not exist
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Solve the problem.The speed of a stream is 4 mph. If a boat travels 88 miles downstream in the same time that it takes to travel 44 miles upstream, what is the speed of the boat in still water?
A. 14 mph B. 8 mph C. 12 mph D. 15 mph
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Evaluate the integral.
A. 
B. 
C. Diverges
D. 1
Mathematics
Find the domain of the function 
What will be an ideal response?
Mathematics