Which expression is equivalent to (x^4/3x^2/3)^1/3

Which of these choices show a pair of equivalent expressions?

Each of the four sides of a swimming pool measures 9 meters. the pool is 5 meters deep. how much water will be needed to fill it completely? a. 45 cubic meters b. 81 cubic meters c. 225 cubic meters d. 405 cubic meters reset next

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)