Solve the problem.A boat traveled for 3 hr with a 7-mph current to reach a picnic area. The return trip against the same current took 6 hr. Find the speed of the boat in still water.
A. 49 mph
B. 28 mph
C. 21 mph
D. 84 mph
Answer: C
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In the given voting system, the weights represent, in order, voters A, B, C, and so on. Determine which voters are critical in the indicated coalition.[12 : 1, 3, 5, 7] ; coalition {B, C, D}
A. Only C and D are critical. B. Only D is critical. C. Only B is critical. D. All are critical.
Match the equation with the appropriate graph.y = 4x + 6
A. 
B. 
C. 
D. 
Let x represent the number. Write the English phrase as an algebraic expression.Seven times a number decreased by three-fourths of the same number.
A. 7(x - 
)
B. 
- 7x
C. 7x - 
D. 7x - 
The Falls Incline Railway in Niagara Falls, Ontario, Canada is an inclined railway that was designed to carry people from the City of Niagara Falls to Queen Victoria Park. The railway is approximately 170 feet long with a 40% uphill grade (see figure). Using the origin of a rectangular coordinate system as the base of the inclined plane, find the equation of the line that models the railway track.
?
?
?
A. 
B. 
C. 
D. 
E. 