Use basic identities to simplify the expression.sin2? + tan2? + cos2?
A. tan2?
B. sin ?
C. cos3?
D. sec2?
Answer: D
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Solve the problem.Find the volume of the region enclosed by the sphere 
and the cylinder 
A. 
(3? - 4)
B. 
(3? - 4)
C. 
(3? - 4)
D. 
(3? - 4)
Write an equation of the line with the given slope, m, and y-intercept (0, b).m = - 
, b = 9
A. y = - 
x + 9
B. y = 
x + 9
C. y = - 
x - 9
D. y = 
x - 9
Determine if the statement is a proportion.I. 
II. 
A. I is a proportion, II is not a proportion. B. I is not a proportion, II is a proportion. C. I and II are both proportions. D. Neither I nor II are proportions.
For the following pair of equations, predict whether they represent parallel lines, perpendicular lines, or lines that intersect but are not perpendicular.9.3x + 9.8y = 8.4 and 9.8x - 9.3y = 8.6
A. parallel lines B. lines that intersect but are not perpendicular C. perpendicular lines