Solve the problem.Bill swims at a speed of 6.7 mph in still water. The river he's in flows at a speed of 2.1 mph. How long will it take Bill to swim 2.7 mi upstream? Round your answer to the nearest tenth of an hour, if necessary.
A. 0.6 hr
B. 12.4 hr
C. 1.7 hr
D. 0.3 hr
Answer: A
Mathematics
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Solve.A railroad tunnel is shaped like a semi-ellipse. The height of the tunnel at the center is 54 ft and the vertical clearance must be 18 ft at a point 8 ft from the center. Find an equation for the ellipse.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics
Provide an appropriate response.If a bond sells for less than its face value, it is said to have sold at a:
A. discount B. premium C. loss D. junk bond
Mathematics
Solve the equation.10 + 4p = 8
A. p = - 
B. p = 
C. p = 
D. p = 
Mathematics
Use the product rule to simplify the expression.
A. 9
B. 9
C. 6x2
D. 486x
Mathematics