PLEASE HELPP PRE CAL

What is the greatest common factor of 8m^2, 4m, and 10m^4

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Divide reduce the answer to lowest term 3/7 divided 1 1/6

Which answer choice is it? is it the first ,second,third or fourth giving 40 points for whoever answers correctly you