Which expression is equivalent to (x y) z?
(x + y) + z
2 z (x y)
x (y z)
x (y + z)

At the county fair, animals are judged for the quality of their breeding and health. the animal pens are arranged in an array, with one animal in each pen. a barn can hold at most 10 rows of pens and at most 6 pens in each row, with room for people to walk around them. what different ways can the planners of the county fair arrange the pens for the horses and cows in the same barn?

The olympic-size pool at the recreational center is a right rectangular prism 50m long and 25m wide. the pool contains 3000m of water. how deep is the water in the pool?

Number patterns 54, 18, 6, 2, 2/3, what are the next 2 terms?