Please help im stuck and i dont have time

In a school 2/3 of the students study a language of those who study a language 2/5 study french

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

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.