1.3a+3 2.6b+2c 3.7n+2c 4.12g-36p+24

It seems like you've provided several algebraic expressions. If you need help with these expressions, let me know what specific operation or manipulation you would like to perform, such as simplifying, factoring, or solving for a variable. Here’s a brief overview of what you could do with them:

1. Simplifying: Combine like terms.
2. Factoring: Rewrite the expression as a product of its factors.
3. Evaluating: Substitute specific values for the variables.
4. Solving: If set equal to a value, find the variable.

Please clarify how you'd like to proceed!