Betty is pushing a chair with 4 N of force to the right. Damian helps her by pushing with a force of 6 N in the same direction. What is the net force? last question i need can anyone help ?

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds