Answer:
16xb
Explanation:
In algebra the numbers are multiplied with the numbers and the variables are multiplied with the variables.
In this question we would multiply x with b and 4 with 4 .
Multiplying x with b would give xb and 4 with 4 gives 16
So the answer will be 16xb
For example if you have 3x and 10 z the answer would be 30xz