The average is 105.5. To find the average, you have to add up all numbers, 63+148=211. Now you have to divide by how many numbers there are, 211÷2=105.5
I think the answer is 25 squared.
4 times the sum of f and g: 4(f+g)
6 times g: 6g
So equation : 4(f+g) = 6g
The action of crashing would lower the speed by at least half so 1.5 + 2.5 = 4. But since you do not know in which way they crashed I would just say that this question is not telling how much they slow down so, I would just do 5 m/s + 3 m/s = 8 m/s travelling in the direction Amy was moving but since the larger mass would move the smaller mass and adjust I'd say they are both moving at 3 m/s.
