answer:
d: 30
all angles in a triangle have a sum of 180 degrees. Just add 50 and 100 (so 150) and do 180-150=30.
uh i did this wrong so uh just ignore what i said
Answer: 
Step-by-step explanation:
10 pens - 2 pens = 8 pens
Write 8 of 10 as a fraction.
You get
, right?
Now, simplify 8/10.
You get 4/5.