Answer:
1.3n + 9.6
Explanation:
We can first gather the terms with the same variable to simplify the expression and combine like terms. In this case, we have 3.4n and -2.1n, which have the variable n. So, we can combine these terms by subtracting the coefficient of n:
3.4n - 2.1n = 1.3n
Next, we can add the constant terms 9.6:
1.3n + 9.6
So the simplified expression with combining like terms is 1.3n + 9.6. This means that the original expression 3.4n + 9.6 - 2.1n is equivalent to 1.3n + 9.6 after combining the terms with the same variable.