1. (a) 30 (b) sqrt(250)
2. (a) 455 (b) 100 (c) 120/455
3. (a) 5, 22 (b) 2, 1 (c) 15000, 8.8x10^7
4. (a) 0.7, 0.5, 0.15 (b) 0.3 (c) Yes (d) No (e) No
5. F, F, T