troubleshooting Question

Expressions and like terms

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naseeamFlag for United States of America asked on
Math / Science
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Which expression is the same as 9n+ 3 after combining like terms? :
 
1. 10n^2 - n^2 - 3
2. 3n +7 - 4 + 3n
3. 18 - 15 + 4n + 5n
4. 7n^2 + 2n + 6 - 3
                                       Please help!
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