How do you determine values in Ax^2+Bx+C+R(x)/Q(x)

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.