Had already graded 40 papers and he still needed to grade more. write an equation for how many papers he is grading if he continues to grade 4 papers a minute

Y = 40 + 4m
m = minutes
y = total papers graded

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.