Please help quarter ends tomorrow and I don’t know what to do I’m failing all my classes

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

Daniel bought a computer game for $25 and later sold it to thomas for a 40% profit. how much did daniel sell the computer game for?

Which equation represents a line that passes through the point (9, -4) and has a slope of 3/5?