Solve.A cruise boat travels 12 miles downstream in 4 hours and returns to its starting point upstream in 6 hours. Find the speed of the stream.
A. 5.5 mph
B. 0.5 mph
C. 3 mph
D. 2.5 mph
Answer: B
Mathematics
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Solve the equation.
- 3 = 
A. {-25} B. ? C. {25} D. {5}
Mathematics
Use the limit process to find the slope of the graph of 
at 
.
A. 
B. 
C. 
D. 
E. 
Mathematics
Find the derivative.y = 7x-2 + 12x3 + 16x
A. -14x-1 + 36x2 B. -14x-3 + 36x2 C. -14x-3 + 36x2 + 16 D. -14x-1 + 36x2 + 16
Mathematics
Find the vertex, focus, and directrix of the parabola with the given equation.(y - 1)2 = -12(x - 2)
A. vertex: (2, 1) focus: (5, 1) directrix: x = -1 B. vertex: (2, 1) focus: (-1, 1) directrix: x = 5 C. vertex: (-2, -1) focus: (-5, -1) directrix: x = 1 D. vertex: (1, 2) focus: (-2, 2) directrix: x = 4
Mathematics