the diagram shows a prism whose cross-section is a square. The length of the base of the prism is 19cm and its volume is 1539cm^3. What is the total surface area of prism?

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.