3 years ago

What is the sum of 9+10 (;

Mathematics

1 answer:

garri49 [273]3 years ago

6 0

Answer:

19 or 21.

Step-by-step explanation:

I swear.

5 + 5 = 10

10 + 5 = 15

15 + 4 = 19

________________

9 + 9 = 18

18 + 10 = 28

28 - 5 = 23

There are two nines so

23 - 2 = 21

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