Solve the problem.A formula for the focal length of a lens isf = 
Calculate f (the focal length) for a = 14 cm and b = 6 cm.
A. 7.0 cm
B. 3.0 cm
C. 9.8 cm
D. 4.2 cm
Answer: D
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Provide an appropriate response.L - 2C + 1.57(d + d) + 
will determine the length, L, of a cross belt that goes around two pulleys, where C is the distance between the centers of the pulleys, D is the diameter of one pulley, and d the diameter of the second pulley. Find the diameter of one of the pulleys if the distance between the centers of the pulleys is 20 in., the diameter of one pulley is 10 in., and the length is 68.3 in. Round to the nearest tenth of an inch.
A. 6.9 inches B. 6.0 inches C. 8.2 inches D. 8.0 inches
The following comparison line graph indicates the number of vehicles sold for a seven week period by two different salespeople. Use the graph to answer the question.
During what week did Pat sell the most number of vehicles?
A. Week 5 B. Week 1 C. Week 3 D. Week 7
Identify the number as prime, composite, or neither.374
A. Neither B. Composite C. Prime
Find the part.81% of 100 animals
A. 8100 animals B. 810 animals C. 8 animals D. 81 animals