The order of magnitude for the total length of 6 cars, which average 8 feet
each, is

The Order of Magnitude is 1

Step-by-step explanation:

If

N=a*10^{b}

b is the order of magnitude

Total length = 6 * 8 feet= 48 feet=4.8*10^1 feet

1. d.90

2. e. none of these (80)

3. a. 0

4. b. 6

5. e. none of these (10)

6. a. 5