6th grade question only

what is 5j+6j

What are the domain and range of f(x)=[1/5]x

How do i put 3(x+7) in distributive property

5. which description does not guarantee that a quadrilateral is a squar ajo is a parallelogram with perpendicular diagonals 0% has all sides congruent and all angles congruent o has all right angles and has all sides congruent 10% is both a rectangle and a rhombus 30%