Pls i want help

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

Venita is sewing new curtains. the table below shows the relationship between the number of stitches in a row and the length ofthe row.sewingnumber of stitches length (cm)51 131532024306what is the relationship between the number of stitches and the length? othe number of stitches istimes the length.o. the number of stitches is 3 times the length.

Find the solution set for this equation: t^2+7t=0 separate the two values with a comma.