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1. A town has a population of 100,000 now and the population is increasing 10% every year. What will be the population in 5 years?

2. How many poles will be in a pile of telephone poles if there are 30 in the bottom layer, 29 in the second, and so on, until there is one in the top layer?

3. How far up and down will a ball travel before stopping if it is dropped from a height f 12 m, and each rebound is 1/3 of the previous distance.

1 answer

#1: 100000 * 1.1^5
#2: Sum of the first n integers is n(n+1)/2

#3 12 + 2*4/(1 - 1/3)
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