half of 21 = 10.5
half of 5 = 2.5
10.5 - 2.5 = 8
10.5 + 2.5 = 13
13 + 8 = 21
13 - 8 = 5
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It is 21 and 9. Because you halve 30 to get 15, then add 6 to each to get the difference.
what two factors of -21 add up to -6
The two numbers are 21 and 7.
1 and 20.
The two numbers are 4 and 17.