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Two numbers have a sum of -19. one number is x. what expression represents the other number?

What are two numbers that add up to -9 and multiply to -10 best answer gets branliest and 100 extra points

Abby is collecting rainfall data. she finds that one value of the data set is a high-value outlier. which statement must be true? abby will use a different formula for calculating the standard deviation. the outlier will increase the standard deviation of the data set. the spread of the graph of the data will not change. abby will not use the mean when calculating the standard deviation.