What is the descending order of 125x3 343y3?

To express the terms 125x³ and 343y³ in descending order, we first recognize that 125 is (5^3) and 343 is (7^3). Therefore, we can rewrite the expression as ( (5x)^3 ) and ( (7y)^3 ). Since both terms are cubic, the order will depend on the values of (5x) and (7y). If (5x) is greater than (7y), then (125x³) comes first; otherwise, (343y³) comes first.