Sayo

Here's the answers: 1: 2 2: 2 3: 0 4: {1, 2, 3, 4, 6, 8, 12, 24} 5: {2, 4, 6, 8, 10} 6: x ≥ -3 7: 1.25c ≥ 150; c ≥ 120 8: 85 ≤ 83 + 91 + n/3 ≤ 90; 81 ≤ n ≤ 96 9: 2.3 sec and 5 sec 10: {0, 4} 11: {walnuts, peanuts, pistachios, pecans, almonds, Brazil nuts}...