Answer:
4
Step-by-step explanation: i guessed and got it right
sorry if youre looking for an actual education!!
Answer: <
Explantion:

, because you factor the 5 into 10 and 4 so

The second one you want will be integers.
Answer:
40
Step-by-step explanation:
angle AOB= 2x=80
x=80/2
x=40