Solve.Bill swims at a speed of 5.4 mph in still water. The river he's in flows at a speed of 3.8 mph. How long will it take Bill to swim 2.2 mi upstream? Round your answer to the nearest tenth of an hour, if necessary.
A. 0.7 hr
B. 3.5 hr
C. 1.4 hr
D. 0.2 hr
Answer: C
Mathematics
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A. - 
B. -ln 
C. -ln
D. - 
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For problems 5 and 6 use the parabola 
to answer the questions. Write the equation of the directrix.
A. 
B. 
C. 
D. 
E. None of these
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