How to turn 258 out of 300 into a decimal and as a percent

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

What is not true about kl and mn? what is mn? (show your work)

Negative 5 1/12 + negative 4 1/4 + 6 3/4