Writers at Blogsareus. abc are paid $5 per post, and $0.10 per word. Writers at Wewritestuff. xyz are paid $10 per post, and $0.08 per word.
How many words per post would a writer be paid the same (break even) at either site they write for?

Why are u not just putting the numbers this is to much

The shelves will hold 270 books in total

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.