Solve the problem.The focal length f of a lens with index of refraction n is 
= (n - 1)
where R1and R2 are the radii of curvature of the front and back surfaces of the lens. Express f as a rational expression.
A. f = 
B. f = 
C. f = 
D. f = 
Answer: D
Mathematics
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Write the statement with the inequality symbol reversed.18 < 36
A. 36 < 18 B. 36 ? 18 C. 36 > 18 D. 18 > 36
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Solve and graph. Write the result in interval notation.6x ? 36
A. [6, ?)
B. (-?, 6]
C. (6, ?)
D. (-?, 6)
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