ANSWER
4000 cm
Step-by-step explanation
The length of the Argentinosaurus was 40 meters long.
We want to convert its length to centimeters.
To do this, we have that:
1 meter = 100 centimeters
Therefore, to convert the length, we have to multiply 40 meters by 100 centimeters:
=> 40 m = 40 * 100
40 m = 4000 cm
The Argentinosaurus was 4000 centimeters in length.