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
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Find an equation for the line. Write the equation in standard form.Through the origin and (-4, -7)
A. 7x - 4y = 0 B. 7x + 4y = 0 C. -4x + 7y = 0 D. -7x - 4y = 0
Find the domain of the rational function.g(x) = 
A. {x|x ? -5, 5, -2} B. {x|x ? 0, 25} C. {x|x ? -5, 5} D. all real numbers
Concerning Internet use In 1999, 59% of all Caucasians in the U.S., 60% of all African-Americans, 58% of all Hispanics, and 54% of residents not classified into one of these groups used the Internet to search for information. At that time, the U.S. population was 69% Caucasian, 12% African-American, and 13% Hispanic. What percentage of U.S. residents who used the Internet for information search were African-American? Express your answer to the nearest 1%. ?
A. 22% B. 15% C. 87% D. 20% E. 13%
Use a CAS integration utility to evaluate the triple integral of the given function over the specified solid region.
over the tetrahedron bounded by the coordinate planes and the plane 
A. 
B. 939
C. 
D. 