4 6 9 13 18 24 31 39 ...... Add 2 to 4 to get 6 then add 3 to 6 to get 9 then add 4 to 9 to get 13 and so on.
-4-(-9)+(-5) = -4+9-5 = 0
5
the next number in the sequence is 25............starting at the beginning, you add the odd numbers to the existing number to get the answer. Add "1" to 0, get 1; add "3" to 1, get 4; add "5" to 4, get 9; add "7" to 9 to get 16........and add "9" to 16 to get 25.........
-9 = -4 + a +4 +4 <-------- Add 4 to both sides.. -5 = a <----------Thats your final answer .
X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
-4 take the number 1-9 and add 4 and you've got the answer
The next number would be 18.3, 4, 6, 9, 13To get from 3 to 4, you need to add one. To get from 4 to 6, you need to add two. To get from 6 to 9, you need to add three. And so on and so on.
14
you put your finger on the 4 and move it right 9 times
13 + 9 = 22 13 - 9 = 4
9