Provide an appropriate response.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 18 cm and b = 10 cm. Round to the nearest tenth.
A. 9.0 cm
B. 6.4 cm
C. 5.0 cm
D. 11.6 cm
Answer: B
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Provide an appropriate response.Explain in your own words what a complement (with respect to 1 or 100%) is. Using complements, explain how to find the net cost equivalent of a series discount.
What will be an ideal response?
Give all possible rational zeros for the polynomial.f(x) = 2x3 + 6x2 + 12x - 8
A. ±1, ±2, ±4
B. ±1, ± 
, ± 
, ± 
, ±2
C. ±1, ±2, ±4, ±8
D. ±1, ± 
, ±2, ±4, ±8
Find polar coordinates of the given point. Express the answer in degrees 
or radians 
as indicated.Degrees
A. (3, 90°) B. (3, 30°) C. (3, 45°) D. (3, 60°)
Solve the problem.A driver wants to gauge the fuel efficiency of her vehicle at speeds of 30 mph and above. She notices that traveling at an average speed of 30 mph results in a rating of 29 mpg, where as at an average speed of 35 mph, her car rates 19 mpg. Find a linear function 
whose input is the speed in miles per hour and whose output is the gas mileage in miles per gallon.
A. f(x) = 
x + 89
B. f(x) = 
x + 31
C. f(x) = - 2x + 31
D. f(x) = - 2x + 89