The rules of the calculation are:
The complete question is added as an attachment
The equation is given as:
0.738 × 0.28 = 0.20664
When approximated, we have:
0.738 × 0.28 ≈ 0.21
The above approximation can mean any of the following:
Read more about approximation at:
https://brainly.com/question/24491627
#SPJ12