It would be Z-9 since you are subtracting 9 from Z
Answer:

Step-by-step explanation:

The radical symbol when used for a square root means the non-negative square root. You cannot state that sqrt(x^2) = x because x may be negative. That is why you need use the absolute value symbol.
Answer:
no its a not funtion
Step-by-step explanation:
bc 1 n 3 is reapeat