What is an equation of the line that is perpendicular to y=−34x+6 and passes through the point (3, 9)?

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What is r i 4.5+10r=-6.5 with work pls

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.