Adirect variation function contains the points

Pelle's sister is three years older than pelle the father is 5 times as old as pelle the mother was 28 when the sister was born altogether they are 98 years old how old is pelle?

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Which of these tools or constructions is used to inscribe a hexagon inside a circle?