The sum of four and five is nine.
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"The sum of 4 plus 5" can be expressed mathematically as 4 + 5 = 9. Now go do your homework.
It is: 5+4 = 9
4 + 5 = 9 4 and 5 are two numbers with the sum of 9 and have a difference of 5
5 you retards
5 + 4 = 9