How do you turn 3.6 into a fraction

Solve |2x - 5| = 4 if anyone could , that would be great

Four individuals pool money together to start a new business and agree to split the profits equally. n invests $6,000, x invests $2,000, y invests $8,000 and z invests $4,000. if the profits for the first month were $100,000, y receives than if the profits were divided in proportion to how much they invested.

Complete the equation of the live through (-1,6) (7,-2)