Answer:
1: 5n, 2n and n are like terms, 6m and 2m are like terms and 4n (to the power of 3 has no like term)
2: 2g, 3g and g are like terms, nothing else is like terms
3: 7x (to the power of 2) and 3x(to the power of 2) are like terms, and 2 and 3 are like terms, also 3x and x are like terms.
Now Combining
1: 3v and 2v can be combined to make 5v + w = 6v + 8 = 14v - 2 = 12v
2: 8c(to the power of 2) + 2c(to the power of 2) = 10c(squared) You can also combine 6c and 5c = 11c, so 11c + 10c(squared) and 10c(squared) is equal to 10c + 2 so 12c + 11c = 23c
3: so 5e and 2e can be combined to make 7e and 8 and 2 and 13 can be combined to make 23, and the rest cannot be combined, so it is 23 + 7e + 3z = 30e
Hope this helps! :D
Explanation: