Please help! pictures are attached

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

Here is another math questions. i will keep asking different questions. 4^2x=6

Whuch statements about the diagram are true? select all that apply.