Find the coterminal angle for 120\deg

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

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.