What is the simplified form of the following expression? Assume

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Complete the solution of the equation. find the value of y when x equals -5. -4x - 8y = -52

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.