jeffsake jeffsake
  • 16-09-2020
  • Mathematics
contestada

What is the sum of 9+10 (;

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goodmate
goodmate goodmate
  • 16-09-2020

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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