Ijust need . so, with this, since it’s 6.633 then would it just go back to 6.63 or to 6.60?

When you round, if the number you are rounding is more than 0, it will never be rounded down to 0. So 6.63 can never be rounded to 6.60 since 3 is more than 0.
In order to round the hundredths, you need to look at the thousandths. 
The thousandths in 6.633 is the second 3.
Since 3 is less than 5, the first 3 will remain the same.
The correct answer is 6.63

hope this helps =)

The correct answer is 6.63

Cthe residual plot for model 1 has a non random pattern and is a good fit for the data