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2) 4
3) 3a² - 2b + 3y + a² + 5b + 10
= 3a² + a² - 2b + 5b + 3y + 10
= 4a² + 3b + 3y + 10
= 2(2a² + 5) + 3(b + y)
4) (5a + 8b + 5) + (7a + 5b + 8)
= 12a + 13b + 13
5) (8x + 18y + 6z) - (4x + 5y + 2z)
= 8x - 4x + 18y - 5y + 6z - 2z
= 4x + 13y + 4z
6) (10p³ - 7p² + 6) + (2p³ + 6p² + p + 5)
= 12p³ - p² + p + 11
7) 5a² - 7a + 5 - 2a² + 2a - 9
= 3a² + 5a - 4
8) (19p³ - 7q² + 6) - (2p³ - 6q² + p + 5)
= 16p³ - 13q² + p + 1