Look at Michael expression. Why do you add 6+4 first

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

What is the solution to the equation below? 3/x-2+6=square root x-2 +8

Suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a standard deviation of 2.6. find the probability that a given infant is between 14.8 and 25.2 inches long.