The value of w varies directly with z. If z = 4, then w = 12. What is the value of w when z = 6? (TEKS: A2D)

Welp life just is hard

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.