Solve the problem.A boat traveled for 4 hr with a 2.5-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. 12.5 mph
B. 60 mph
C. 27.5 mph
D. 15 mph
Answer: A
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Change the order of integration and evaluate the integral.
A. 12?2 B. 9?2 C. 12? D. 9?
Find the volume of a pyramid 20 ft high with an 8-ft-by-8ft square base.
What will be an ideal response?
Provide an appropriate response.It can be shown that a hyperbola with center at the origin, foci at F'(-c, 0) and F(c, 0), and equation 
has equation 
- 
= 1. Use this result to find an equation of a hyperbola with center at the origin, foci at (-8, 0) and (8, 0), and absolute value of the distances from any point of the hyperbola to the two foci equal to 8.
A. 
- 
= 1
B. 
- 
= 1
C. x2 - y2 = 8
D. 
- 
= 1
Combine like terms.x - 3y + 9 - 5x + 7y - 7
A. 6x + 4y - 2 B. -4x - 4y + 2 C. -4x + 4y + 2 D. 4x + 4y + 2