Value of Integer z - Data Sufficiency

Very Easy Data Sufficiency Determining Sufficiency

What is the value of the integer $z$?

Statement (1): $z + 4 = 10$

Statement (2): $z - 1 = 3$

Each statement alone is sufficient.

Both statements together are sufficient, but neither statement alone is sufficient.

Each statement alone is not sufficient.

The data is insufficient.

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