Suppose that r varies directly with s and inversely with t, and r = 2 when s = 3 and t = 12. What is the value of r when s = 5 and t = 4

A. 2/5

B. 32/5

C. 10

D. 20

How do you answer (-1) to the power of 5?

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Is posible to prove if the subway routes in a city were made using the graph theory? How?

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What two numbers add up to - 3 and multiply to - 100?