Aquantity x varies directly with y and inversely with z. which expression represents the constant of variation, k?

The expression represents the constant of variation k is  .

Step-by-step explanation:

As given

A quantity x varies directly with y and inversely with z.

and

Than combined the above equation.

Where k is the constant of variation.

Than

Therefore the expression represents the constant of variation k is  .

i believe it's a.

i'm not sure on this one, most likely correct.