Answer:
Note that I put an answer for everything not just the ones you left blank.
(+14) + (+9) = +23
(+6) + (-13) = -7
(-4) + (+1) = -3
(-6) + (+10) = +4
(+14) + (+4) = +18
(0) + (+15) = +15
(0) + (-9) = -9
(+1) + (+24) = +25
(+3) + (-14) = -11
(-24) + (+14) = -10
(+17) + (+14) = +31
(+23) + (+14) = +37
(+14) + (+9) = +23
(+21) + (+21) = +42
(-3) + (+4) = +1
Explanation:
(Just a friendly heads-up, you don't have to keep putting the + sign in front of the positive numbers. Numbers without any sign, automatically mean they're positive. It's the negative signs that you need to place a sign.)
Hope this helped :)