To express the relationship between the cost of a t-shirt and the cost of a pair of socks mathematically, we can start with the information given:
- A t-shirt costs $16.
- A t-shirt costs 4 times as much as a pair of socks (s).
This can be written as: \[ 16 = 4s \]
If we want to rearrange this equation, we can express it as: \[ 4s = 16 \]
So the correct mathematical sentence that expresses the information above is: 4s = 16.