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: C
Mathematics
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Determine the greatest common factor for the pair of numbers.45, 54
A. 9 B. 81 C. 45 D. 27
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Graph. Be sure to label the vertex.y = x2 + 2x - 8
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.Rosie can crochet a 5 cm by 49 cm strip in 2 hours. If there is a 1199 cm2 area completed when she starts and she crochets for 5 hours, how much total area will Rosie have finished?
A. 2424 cm2 B. 1444 cm2 C. 612.5 cm2 D. 1811.5 cm2
Mathematics
Find the volume.Find the volume of the given sphere. Use 3.14 for ?. Round to the nearest thousandth, if necessary.
diameter = 2.7 cm
A. 91.562 cm3 B. 10.301 cm3 C. 22.891 cm3 D. 82.406 cm3
Mathematics