C)The difference of thirteen times a number and four.
Step-by-step explanation
Step 1
Let's analyze the expression
we have two terms
the symbol between them is a "-", it represents a subtraction
hence, we have a subtraction
Step 2
a)Now, let's check the firts term
if x represents a number, we would have
thirteen times a number
b) second term
the second term is
four
therefore, the full expression is
C)The difference of thirteen times a number and four.
I hope this helps you