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shusha [124]
3 years ago
15

When is 9+10 really equal to 21

Mathematics
2 answers:
schepotkina [342]3 years ago
4 0

Answer:

9 + 10 = 21

Step-by-step explanation:

9 + 10 = 21

Factor out 9 and 10

9 = 3 · 3   10 = 2 · 5

Next multiply 3 by 2

3 × 2 = 6

Then multiply 3 by 5

3 · 5 = 15

Finally add the products

15 + 6 = 21

Aleksandr [31]3 years ago
4 0
It can never be equal to 21 because that’s not how math works
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