Answer: I don't see a parallegram but will try.
x, y, and z depending on where they are you can either multiply or divide to get the answer, so now that I know I have to multiply or divide I will start with x and then go to y. We need to divide for x and I will start with 1 of your highest numbers on the parallegram. Whatever your highest number is divided by 2 is the answer to x. We need to divide to get y and we are going to divide by using the second highest number and dividing it by 2 and you will get your answer. We will need to multiply for z and we will multiply the number that is in the middle not the highest number or the lowest number or the second highest number, we will need the middle number and we will multiply it by 2.
Explanation: