m. Use the GEMDAS/ PEMDAS rule in evaluating each expression.
6. 21÷ (6-3)
7. 7 + 4 x 2-2
8. 32 ÷ (8x2)-2
9. 15 - 45 ÷ 9 + 7 x 2
10. (21 - 15)² - 20​