exam Maths Puzzle Numerical Ability

Add. 5b^3 - 8b + 2b^2 and 3b^2 - 7b^3 + 5b.

I need a little help with this problem thanks.

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i dont get it i get so confused on algebra Stan invested $17,000, part at 18% and part at 4%. If the total interest at the end of the year is $1,380, how much did he invest at each rate?