Combine the following expressions. (In case you miss the steps and rules, do not hesitate to check them in the previous part of the lesson.)
4. 20h - 5i + 10j - 6k) + (2h + 4i - 3k)
5. 7r²s² + 15rs) + (-4rs + 2r²s²)
4. 20h - 5i + 10j - 6k) + (2h + 4i - 3k)
5. 7r²s² + 15rs) + (-4rs + 2r²s²)
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Answer:
4. 22h+10j-6×jk-3k-i
5. 9r²s²+rs
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