What is the letter for these 2

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

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.

Asinusoidal function whose frequency is 1/6pi