Can someone please solve this?

Step-by-step explanation:

1. D, because the opposite angles have to be angle to be a parallelogram

2. C, again opposite angles have to be equal. You have to plug in the different values of x and the only one that works is 21.

ex.

angle J = 3x + 20

angle J = 3(21) + 20

angle J = 83

angle L = 4x-1

angle L = 4(21)-1

angle L = 83

3. the answer is

yes: BK = DK and CK= AK

no: CK= DK and BK= AK

4. the angle would be the same since opposite so 25 degrees

5. C, because the angles are equal to 180... so draw a picture of a square right down the different angle names, they come out to equal or next to each other.

Hope this helped