7b - 2/5 = 6b - 7/5 equations with variables on both sides: decimals & fractions

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

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.

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x