Take25points. please helping me now Please help me Solve this questions in math just look The picture

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

With #! i’ve tried to figure it out but i can’t.

Solve the equation w^3 = 1,000 i honestly dont know how to punch this into a calculator pls