Answer:To simplify the expression (5a - 2b + 4c) + (-a - 3b + 8c), we combine the like terms: (5a - a) + (-2b - 3b) + (4c + 8c)Combine the coefficients for each variable:For a: 5a - a = 4aFor b: -2b - 3b = -5bFor c: 4c + 8c = 12cSo, the simplified expression is:4a - 5b + 12c