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destinyhope4776
25.10.2021 •
Mathematics
Keiko buys a bottle of water for $2.19. She gives the cashier a $10. How much should she get back?
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Ответ:
$7.81
Step-by-step explanation:
10-2.19
Ответ:
Ответ:
Step-by-step explanation:
Given
Required
Find n
To do this, we simply apply permutations formula
So, we have:
Expand
Open bracket
Collect like terms
Expand
Factorize
Factor out n + 9
Split
Solve for n
The positive value is![n = 8](/tpl/images/1395/5881/1206b.png)