Solve the problem.A formula for the focal length of a lens is f = . Calculate f (the focal length) for a = 6 cm and b = 8 cm. Round to the nearest tenth of a centimeter, if necessary.

A. 3.0 cm
B. 2.6 cm
C. 3.4 cm
D. 4.0 cm


Answer: C

Mathematics

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Change the Cartesian integral to an equivalent polar integral, and then evaluate.

A.
B.
C.
D.

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Give an appropriate answer.The following table shows the average life expectancy in a certain country in the given years. Draw a bar graph that makes the increase in the life expectancy look large.

What will be an ideal response?

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For an election with 4 candidates (A, B, C, and D), we have the following preference schedule: Using the plurality method, the winner of the election is

A. A. B. B. C. C. D. D. E. none of these

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Provide an appropriate response. Graph sin x, sin 2x, and sin 0.5x on the same graph. Compare the graphs. How are they alike and how are they different? Use a graphing calculator.

What will be an ideal response?

Mathematics