In the given expression 6X² + 13X +6, we can easily identify the values of a, b and c. These values are a=6, b=13 and c=6 For the value of "ac", we have: ac=6*6 ac=36 For a sum of b are 4, we have ac+b=36+13=49 Therefore, the answer for the last question "The two numbers that have a product of ac and a sum of b are 4 and 9".