10.3
13
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.
12+9=21 21+15=36 36+13=49 49+6=55
16+13+12+929+12+941+950
X - 4 = 9 add 4 to each side X = 13 check 13 - 4 = 9 9 = 9
13 + 9 = 22 13 - 9 = 4
9 and 4 add up to give 13.
The factors of 9 are 1, 3, and 9. 1 + 3 + 9 = 13
-9 and -13 -9 times -13 = 117 -9 plus -13 = -22
1, 3, 5, 7, 9, 11, 13 ... (add 2) 1, 5, 9, 13 ... (add 4) 1, 2.5, 4, 5.5, 7, 8.5, 10, 11.5, 13 ... (add 1.5) 1, 7, 13 ... (add 6) There are many others ... probably an infinite number of others.
Convert 2/3 to 6/9, then you can add the whole parts, and add the fractions, you will have: (9 + 2) + (6/9 + 7/9) = 11 + 13/9. 13/9 is the same as 1 4/9, so then you have 124/9.
you need 11 more.