Solve the equation on the interval 0 ? ? < 2?.cos2 ? - 1 = 0
A. 
, 
B. 0, ?
C. 
D. 0
Answer: B
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Graph the parabola or ellipse. Include the directrix that corresponds to the focus at the origin.r = 
A. 
B. 
C. 
D. 
Solve the problem.?1 and ?2 are supplementary angles. What are the measures of the two angles? 
A. ?1 = 10°, ?2 = 81° B. ?1 = 9°, ?2 = 81° C. ?1 = 18°, ?2 = 162° D. ?1 = 20°, ?2 = 162°
Solve the problem.The intensity of a radio signal from the radio station varies inversely as the square of the distance from the station. Suppose the the intensity is 8000 units at a distance of 2 miles. What will the intensity be at a distance of 12 miles? Round your answer to the nearest unit.
A. 248 units B. 222 units C. 205 units D. 186 units
Indicate whether the function is one-to-one.{(8, 6), (9, 6), (10, -5), (11, -3)}
A. Yes B. No