Answer:
28. W=20ft
29. -340
30. 56, 57, 58
Step-by-step explanation: For 28
1. A = L*W
2. A = 240
3. 240 = 12*W
4. (240/12) = W
5. 20ft = W
Step-by-step explanation: For 29
X +300 = -40
X = -40 - 300
X = -340
Step-by-step explanation: For 30
171/3 = 57, therefore 57 is the average
56, 57, 58
