Write N if the expression is numerical, and write A if the expression is
algebraic.
_____ 1. 4x2 _____ 6. 12 – x
_____ 2. 3xy _____ 7. 28 – 6
_____ 3. x – 4 _____ 8. 2y + 4
_____ 4. 2(5 + 7) _____ 9. 12 – 6
_____ 5. 23 + (-4) _____ 10. 10 –2 + 6