Use a double-angle formula to rewrite the expression.
?
3 - 6 sin2 x
?
A. 6 cos x
B. ?3 sin 2x
C. ?3 sin x
D. ?3 cos 2x
E. ?6 cos 2x
Answer: D
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Find the point at which the line given by the parametric equations below intersects the plane.
 Figure 3.png)
Determine whether the statement is true or false.The intersection of the set of rational numbers and the set of whole numbers is the set of rational numbers.
A. True B. False
Find a cartesian equation of the following curve, assuming the center is at the origin. Use a graphing utility to check your work.A hyperbola with foci (±9, 0) and eccentricity 
A. 
- 
= 1
B. 
+ 
= 1
C. 
- 
= 1
D. 
+ 
= 1
Solve the problem.A weather forecaster predicts that the temperature will drop 2 degrees each hour for the next 3 hours. If the temperature is 1 degrees before the temperature starts falling, what is the temperature after the drop?
A. -4° B. -5° C. -6° D. 6°