Expand 4(3z−7)

To expand the expression \( 4(3z - 7) \), you distribute the 4 to both terms inside the parentheses:

\[ 4(3z) - 4(7) \]

Calculating each term gives:

\[ 12z - 28 \]

So, the expanded form of \( 4(3z - 7) \) is:

\[ 12z - 28 \]