Question

the average mass of an automobile in the United States is about 1.440 × 10^8 . express this mass in kilograms

Answer 1

You didn't state the starting unit, but I assume you want pounds into kg. 
1lb = 0.45359237kg.
1.440 x 10^8lbs * 0.45359237kg/1lb = 65317301.28 or 6.531730128 x 10^7

Answer 2

Answer:

65317248 kg

Explanation:

In the United States mass is expressed in pounds (lb), which is an imperial unit of mass.

$1\ lb=0.453592\ kg$

$\\\Rightarrow 1.44\times 10^8\ lb =1.44\times 10^8\times 0.453592\\\Rightarrow 1.44\times 10^8\ lb =65317248\ kg$

The average mass of an automobile in the United States is 65317248 kg.