Answer:
it dropped -141 in 60 seconds so 141/60 = 2.35 ft per second
Step-by-step explanation:
No
The car starts at 20 000
After 1 year, it's worth 18 000
After 2 years, it's worth 14 400
After 3 years, it's worth 11 600
After 4 years, it's worth 9 280
After 5 years, it's worth 7 424
After 6 years, it's worth 5 975.20
No, the family should not sell the car for 4000
x * 2/5 = 3/20
2/5 = 0.4
3/20 = 0.15
0.15 / 0.4 = 0.375
0.375 = x
x = 3/8