II.
Perform the indicated operation.
A.
1. 2x + 3x =
2. -5m + (-12m) =
3. 6x2y3 + 9x²y3 + (-4x2y3) =
4. (3a + 5b) + (7a + 16b) =
5. (5x + 2y + 4z) + (3x - 7y + 5z) =
B.
6. 7ab - 5ab =
7. -4n - 5n =
8. 2c2d5 - (-8c2d5) --
9. (6x + 8y) --- (4x + 5y) =
10. (8x2 - 15x + 9) -- (3x2 + 2x + 1) =​