How do you simplify 8^3

For the equations below which statement is true ? -2x=14 6x=-42

5/6+7/8what is the answer sealsdbdbshd

Which equation represents the model shown? a)1/3 divide 1/6 = 2 b)2/3 divide 1/6 = 2/18 c)1/3 divide 1/6 = 1/18 d)2/3 divide 1/6 =4