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. This situation is now represented by the polar graph in the figure shown below. Each point (r, ?) on the graph gives the sailing speed, r, in knots, at an angle ? to the 10-knot wind. What angle to the wind produces the maximum sailing speed? What is the speed to the nearest knot, of the sailboat sailing at 90° angle to the wind? 
A. 90°; 7 knots
B. 120°; 8 knots
C. 120°; 7 knots
D. 90°; 5 knots
Answer: C
Mathematics
You might also like to view...
Using Green's Theorem, compute the counterclockwise circulation of F around the closed curve C.F = (x - y)i + (x + y)j; C is the triangle with vertices at (0, 0), (8, 0), and (0, 9)
A. 0 B. 648 C. 72 D. 144
Mathematics
Find the area of the shaded region of the figure. Use 3.14 for ? as necessary.
A. 55.86 cm2 B. 104.86 cm2 C. 52.43 cm2 D. 258.72 cm2
Mathematics
Find the domain of the rational function.f(x) = 
A. {x|x ? 6, x ? -8} B. {x|x ? 6, x ? -8, x ? -5} C. {x|x ? -6, x ? 8} D. all real numbers
Mathematics
Subtract and, if possible, simplify.- 
- 
A. - 
B. 
C. - 1
D. 1
Mathematics