Why do you think it's important that we always label our units on word problems

Its important because the person needs to know the quantity or amount of what ur measuring. For example, let's say the answer is 12. 12 what? Dinosaurs, trains?

What is the diagram u didn't post 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.