Respuesta :

The answer is 9r^3+2r^4
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ivana2103
4r^3 + 3r^4 - r^4 + 5r^3

*Add or subtract every “similar” number (so r^4 with r^4 and r^3 with r^3)

9r^3 + 2r^4

You can simplify even further:
r^3*(9+2r)

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