Which statement about the equation y = 4x + 6 is true?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Solve the equation x/4 - 5= -8 -27 -12 -7 12

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.