z(-3)

To find the value of z(-3), you would need to know the definition or the specific equation that z represents. Without that information, it is difficult to provide an accurate answer.

However, if z has been defined as a function, such as z(x) = 2x + 1, you can substitute the value -3 into the equation:

z(-3) = 2 * (-3) + 1
z(-3) = -6 + 1
z(-3) = -5

In this case, z(-3) would equal -5.

If you have access to the definition of z or any other relevant information about the equation or function, please provide it so that a more specific answer can be provided.