How to add polynomials in brackets

Answer-

The innermost parentheses are calculated first, followed by the brackets that form the next layer outwards, followed by braces that form a third layer outwards. Within and outside of parentheses, brackets, and braces, you then follow the normal order of operations as laid out by PEMDAS or other acronyms.

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The key is the word about, they want an estimation.63 is closer to 60, 71 is closer to 7060 + 70 = 130ryan counted about 130 birds