Q1 FOR Z IS ????
Q3 FOR Z IS ???
You will need to post the questions if you expect someone to help you answer them...
Here lies the reader who will never open this book. He is forever dead.
Taking a new step, uttering a new word, is what people fear most. ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.