Question

What would this be, please help me.

Answer 1

I think it is 6.

Explanation:

on a parrelelogram parrelell sides r =. this means that 6x-15=x+15

we can subtract x from both sides and get 5x-15=15. add 15 to both sides and get 5x=30. Divide both sides by 5 and get x=6.