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Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42