Question

the difference between thirteen and the product of four and a number? in algrebrain expression

Answer 1

I think it is 4 x y - 13

Answer 2

 Difference between A and B can be written as A-B. 
" thirteen (A) and the product of four and a number(B)"
 "thirteen "- "the product(*) of four and a number"
13 -4*n =13-4n