Please help ASAP I’ll mark you as brainlister

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

If the class was going to get a class pet and 5 picked fish and 7 pick bird and 8 picked rabbits have many students were in the

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?