Answer:1. (20 + 12) + 4 = 32 + 4 = 362. 50 + 6 × (11 - 4) = 50 + 6 × 7 = 50 + 42 = 923. 9 × (12 - 8) + 28 + 7 = 9 × 4 + 28 + 7 = 36 + 28 + 7 = 714. 7 × 2 - (9 + 2) + 14 = 14 - 11 + 14 = 3 + 14 = 175. 11 × 4 - (6 + 3 + 13) + 2 = 44 - 22 + 2 = 22 + 2 = 246. 36 + 3 × (7 - 2 - 4) × 2 = 36 + 3 × 1 × 2 = 36 + 6 = 427. 18 + (21 - 5) + (22 - 18) = 18 + 16 + 4 = 388. (63 + 5) × (11 - 4) = 68 × 7 = 4769. 8 × (36 + 2) - (56 + 24) + 4 = 8 × 38 - 80 + 4 = 304 - 80 + 4 = 22810. 20 - (5 × (7 + 2)) + 31 = 20 - 45 + 31 = -25 + 31 = 6drop a heart and rate!