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Which expression is equivalent to 3^3 + 2^2?

Find the zeros of each function. f(x) = 6x^2 - 7x - 20

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.