The question has infinite correct answers. Some are -8 and 0, -7 and -1, -9 and 1, etc.
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31 & 67
9 and 36
When you add two or more prime numbers you will only end up with a whole number and not a decimal number.
No two prime numbers can add to 119.
To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.