Solve the problem.The wind is blowing at 10 knots. Sailboat racers look for a sailing angle to the 10-knot wind that produces maximum sailing speed. In this application, (r, ?) describes the sailing speed r, in knots, at angle ? to the 10-knot wind. Four points in this 10-knot-wind situation are (6.9, 65°), (7.5, 85°), 
and 
. Based on theses points, which sailing angle to the 10-knot wind would you recommend to a serious sailboat racer? What sailing speed is achieved at this angle?
A. 110°; 7.6 knots
B. 85°; 7.5 knots
C. 130°; 7.4 knots
D. 65°; 6.9 knots
Answer: A
Mathematics
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A. 3x2 + 4x - 5
B. 3x2 + 4x - 5 + 
C. 3x2 + 4x - 5 + 
D. x2 - 5 + 
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?
; 
?
A. 
,
B. 
, 
C. 
,
D. 
,
E. 
,
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A. A-1 = 
B. A-1 = 
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Mathematics