The expression $3x4t$ can be simplified by multiplying the constants together.

$3 \times 4 = 12$

So, the simplified expression is:

$12xt$

Let me know if you need further clarification or help!

Related Questions:

1. How do you simplify expressions with variables and constants?
2. What is the distributive property and how can it help in simplification?
3. How can you combine like terms in an expression?
4. What is the difference between multiplying and adding variables?
5. How do you factor expressions like $12xt$?

Tip:

Always look for constants (numbers) to multiply first before dealing with variables!