To simplify the expression \( \frac{t400}{t100} \), we need to clarify what "t400" and "t100" represent. If we assume they refer to numbers or values, we'd simplify as follows:
Assuming \( t400 = 400 \) and \( t100 = 100 \):
\[ \frac{t400}{t100} = \frac{400}{100} = 4 \]
If "t" represents a variable, you would typically simplify it as follows:
\[ \frac{t400}{t100} = \frac{t \cdot 400}{t \cdot 100} = \frac{400}{100} = 4 \quad (\text{assuming } t \neq 0) \]
So, regardless of the context, as long as \( t \neq 0 \), the answer simplifies to \( 4 \). If "t400" and "t100" refer specifically to other variables or contexts, please clarify, and I can help further.