1 EASY Factor $$2x + 2$$.

 2 EASY Factor $$3y + 3x$$.

 3 EASY Factor $$5x - 5z$$.

 4 MEDIUM Which of the following is a valid factor of $$3x+4$$? $$x$$$$-4$$$$4x + 3$$$$3x - 4$$None of the above

 5 MEDIUM Factor $$5x + 10$$.

 6 MEDIUM Factor $$12x-15$$.

 7 MEDIUM Can $$7x + 4$$ be factored?

 8 MEDIUM Factor $$24xy + 12x$$.

 9 HARD What are the factors of $$x^2 - x$$? $$x$$ and $$x - 1$$$$x^2 + x$$ and $$-1$$$$x^2 - 1$$ and $$x$$$$x^2$$ and $$-x$$None of the above

 10 HARD Factor $$x^4y^2z + y^2z^2$$.