Write a story problem that can be solved by finding the sum of 506, 211 and 424,809.than solve the problem

Multiply by the reciprocal by 3 and divide the common denominator by 14

What do you mean by that?

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.