3. order the following lengths from shortest to longest.
a. 400 millimeters
b. 22 kilometers
c. 170 meters
d. 3.3 centimeters

Explanation:

Firstly, let's convert these length to meters , in order to work with the same units:

a. 400 millimeters

b. 22 kilometers

c. 170 meters

Here the lenght is already in meters

d. 3.3 centimeters

Now that we have all the lengths in meters, we can order them from shortest to longest:

or

i think the answer is a, hope this : )