1. 2(x+1)
  2. 3(y + x)
  3. 5(x-z)
  4. (E) None of the above
  5. 5(x+2)
  6. 3(4x-5)
  7. No.
  8. 12x(2y + 1)
  9. (A) \(x\) and \(x - 1\)
  10. \(y^2z(x^4 + z)\)