david invest $10,000 in a CD that pays 8% compounded quarterly. how long will it take his investment to double

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.

Evaluate 8j -k+148j−k+14 when j=0.25j=0.25 and k=1k=1.

Which value of y will make the inequality y< -1 false?