Awoman is twice as old as her daughter. twenty years ago, she was four times as old as he daughter. how old are they now? (i don’t get this one cuz it’s subtracting instead of adding and it made me confuzzled)

So for this, you might want to set up some equations.

The mom's variable is m and the daughter's is d.  

So now is it m=2d

And twenty years ago it was m-20=4(d-20)  which is the same as m-20=4d-80.

Simplify so it is m=4d-60. Now, plug it in as m in the first equation. 

4d-60=2d           2d=60        d=30  

Now, we know that the mom must be 60 and the daughter 30 years old.

Opposite angles in a cyclic quadrilateral add up to 180°