Answer:
The answer is number 4
Explanation:
If the final sum of the products is thirteen, and you have a factor with is nine, then thirteen minus nine is four, therefore the other factor in your equation of two factors is four, and it can be stated as nine plus four equal thirteen, where you have the two factors and the sum of your two factors corresponds to the number given, thirteen. (13-9 = 4) 4 is the factor and 4+9=13
