Can someone help me with this, 20 points, and these three questions? Will give brainliest!!

Compare the subtraction problems 6/8 - 5/8 = 1/8 and 6/9 - 7/9 = 1/9 why is the answer to the first problem positive and the answer to the second problem negative

Antonia and carla have an equivalant percentage of green marbles in their bags of marbles. antonia has 4 green marbles and 16 total matbles. if carla has 10 green marbles , how many total marbles does carla have

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°