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Verified answer
(16c + 11b - 4a) + (8a + b - 5c)= 16c - 5c + 11b + b - 4a + 8a
= (16 - 5)c + (11 + 1)b + (-4 + 8)a
= 11c + 12b + 4a
(16c + 11b - 4a) - (8a + b - 5c)
= 16c + 11b - 4a - 8a - b + 5c
= 16c + 5c + 11b - b - 4a - 8a
= (16 + 5)c + (11 - 1)b + (-4 - 8)a
= 21c + 10b - 12a