ASAP in pic BRAILIST and pts

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

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.

Solve the formula ax+ by = c for x.