Answer: 1. 2a + 10b
2. 5n - 8c
Step-by-step explanation:
1. 5(a + 2b) -> multiply each term in the bracket by 5. this will give 5a + 10b. then add the -3a to give 2a + 10b
2. 4(n-2c) -> multiply each term in the bracket by 4. this will give 4n - 8c. then add the n to give 5n - 8c
