A man is twice as old as his son. 20 years ago the sum of their age is 85

In the rectangle below ac=30 units what is de

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.

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)