Which set of three numbers could be the side lengths of a triangle

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

Write each fraction as an equivalent fraction with a denominator of 120then write the original fractions in order from samllest to largest

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)