Solve.After being struck with a hammer, a gong vibrates 45 vibrations in the first second and in each second thereafter makes  as many vibrations as in the previous second. Find how many vibrations the gong makes before it stops vibrating.

A. 54 vibrations
B. 270 vibrations
C. 280 vibrations
D. 49 vibrations


Answer: B

Mathematics

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The graph of a rational function y = f(x) is given below. Use the graph to give the solution set of   and  Use set notation for part (a) and interval notation for parts (b) and (c).

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Mathematics