Answer:
2. a = 9 - 1 = 8
3. b = 10 - 4 = 6
4. 8² + 6² = c²
c² = 64 + 36 = 100
c = √100 = 10
5a. a + b = 8 + 6 = 14
5b. distance > displacement
6a. 7km + 18km + 4km = 29km
6b. (-7km) + (+18km) + (-4km) = +7km
7a. (30m + 30m) * 6 = 360m
7b. (30m + (-30m)) * 6 = 0 * 6 = 0m
8a. 14m + 24m = 38m
8b. (-14m)² + (24m)² = c²
c² = 196m² + 576m² = 772m²
c =√772m² = 27.8m
9. v = (-0.87m/s) + (+0.32m/s)
a) v = -0.55m/s
b) south
10a. 8.6m + 4.2m + 6.5m = 19.3m
10b. (-8.6m - 6.4m)² + (-4.2m)² = c²
c² = 225m² + 17.64m² = 242.64m²
c = √242.64m² = 15.6m