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Find the roots of the equation below. x^2 - 6 + 9 = 0

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Over the course of the school year, you keep track of how much snow falls on a given day and whether it was a snow day. your data indicates that of twenty-one days with less than three inches of snow, five were snow days, while of the eight days with more than three inches of snow, six were snow days. if all you know about a day is that it is snowing, what is the probability that it will be a snow day?