plsss help me as fast as u can thank youuu

Fill in the blanks: Find the critical value, given the information below: 1. One-tailed test; variance is known, a = 0.05, n = 35 z = 2. Two-tailed test, variance is known, a = 0.05, n = 40 z = = 3. One-tailed test; variance is unknown, a = 0.05, n = 15 z = 4. Two-tailed test; variance is unknown, a = 0.05, n = 20 z = = 5. One-tailed test; variance is known, a = 0.01, n = 50 z = 6. Two-tailed test; variance is known, a = 0.01, n = 40 z = = 7. One-tailed test, variance is unknown, a = 0.05, n = 25 z = 8. Two-tailed test; variance is unknown, a = 0.10, n = 18 z = = 9. One-tailed test; variance is known, a = 0.08, n = 55 z = 10. Two-tailed test, variance is unknown, a = 0.09, n = 280 z = =