Can anyone solve these 3?

What is the solution set of the quadratic inequality x^2-5< or equal to 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.

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take