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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Decide whether the statement is true or false. If it is false, tell why.If k is a negative integer, then x2 = k will have two irrational solutions.
A. True B. False; the equation will have no real number solutions. C. False; the equation will have two rational solutions.
Solve.A lake is stocked with 574 fish of a new variety. The size of the lake, the availability of food, and the number of other fish restrict growth in the lake to a limiting value of 3587. The population of fish in the lake after time t, in months, is given by the function P(t) = 
. Find the population after 15 month(s).
A. 3265 B. 3290 C. 3285 D. 3275
Find the value of the expression using the given values.
?x = 7, y = 5
A. 
B. 
C. 
D. 1
Add or subtract as indicated.
+ 
A. 
B. 
C. 
D. 