On a standardized exam, the scores are normally distributed with a mean of 110 and a standard deviation of 20. Find the z-score of a person who scored 128 on the exam.​

It has a slope of 1 nd a y intercept of -2

The solution to the system of equations (-2,2)

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.