Simplify the Expression: 3z + 19z - 4z | Step-by-Step Solution

To solve this problem, we'll follow these steps:

• Step 1: Combine like terms by identifying and adding their coefficients.
• Step 2: Simplify the expression.
• Step 3: Verify the resulting expression with the provided choices.

Let's work through each step:

Step 1: Identify the coefficients in the expression $3z + 19z - 4z$. The coefficients are $3$, $19$, and $-4$.

Step 2: Add and subtract these coefficients: $3 + 19 - 4$.

Step 3: Calculate: $3 + 19 = 22$ and then $22 - 4 = 18$.

Therefore, the simplified expression is $18z$.

The solution to the problem is $18z$.