Solve the problem.A boat goes 120 miles downstream in the same time it can go 90 miles upstream. The speed of the current is 4 miles per hour. Find the speed of the boat in still water.
A. 24 mph
B. 28 mph
C. 21 mph
D. 32 mph
Answer: B
Mathematics
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Use the graph to find the vertex, the axis of symmetry, and the maximum or minimum value of the function.
A. (-2, 4); x = 2; maximum: -4 B. (-4, -2); x = -4; maximum: 2 C. (-4, 2); x = -4; maximum: 2 D. (2, -4); x = 2; maximum: -4
Mathematics
Provide an appropriate response.If X is normally distributed with ? = 40 and ? = 6, find P(X ? 37).
Fill in the blank(s) with the appropriate word(s).
Mathematics
Without graphing, find the line of symmetry.f(x) = -(x + 2)2 + 8
A. x = -2 B. x = 3 C. x = 4 D. x = 8
Mathematics
Provide an appropriate response.Find the opposite of -12.
A. - 
B. 0
C. -12
D. 12
Mathematics