I don't know how to solve this.
what is numerical coefficient of this term -3z
To find the numerical coefficient of the term -3z, you need to understand that a numerical coefficient is the number in front of a variable. In this case, the variable is z.
To get the numerical coefficient, simply look at the term -3z. The number directly in front of the variable z is -3. Therefore, the numerical coefficient of the term -3z is -3.