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1.) The number of bacteria in a jar triples every twenty seconds. After three minutes, 275,562 bacteria are in the jar. How many bacteria were in the jar at the beginning of the experiment?

2.) Of a set of five consecutive integers, the sum of the squares of three smallest equals the sum of the squares of the two largest. Find all possible values for the five integers.

3.) If three quarters are tossed and if at least one lands tails up, what is the probability that at least one lands heads up?

pplese help. or i will be !1