1 19/100 is your answer........
You have to factor by grouping.
(4a - 5) (a + 4)
Answer: Seven Hundred Ninety-Five Billion Eight Hundred Sixty Million Nine Hundred Thirteen Thousand Seven Hundred Eighty-Nine
Step-by-step explanation: My head
403446 is around 400000 so you round that up in your head. 396755 is close to 400000 so you round that up in your head to. Then you add them together to get 800000, which you can do in your head.