Combining like terms need help ASAP
9a-10a

We just started the introduction into circles and i have no idea how to do this.

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.

What is the ordered pair of m’ after point m (5, 6) is rotated 90° counterclockwise?