The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).y = x
A. r = cos ?
B. r = sin ?
C. sin ? = - cos ?
D. sin ? = cos ?
Answer: D
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Solve the problem.Suppose that h is continuous and that 
= 2 and 
Find 
and
A. 10; -10 B. 6; -6 C. -10; 10 D. -6; 6
Solve the problem.Carol and Lu Yi carry a total of 6.5 liters of water as they begin a day hike. How many gallons of water are they carrying, to the nearest tenth?
A. 6.9 gal B. 24.6 gal C. 6.2 gal D. 1.7 gal
Solve the problem.A wheel with a 40-inch radius is marked at two points on the rim. The distance between the marks along the wheel is found to be 12 inches. What is the angle (to the nearest tenth of a degree) between the radii to the two marks?
A. 17.2° B. 13.2° C. 15.2° D. 19.2°
Convert the angle from degree measure to radian measure. Round to the nearest hundredth of a radian when appropriate.720°
A. 
B. 
C. 8?
D. 4?