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.
Welcome to the forum. Why hate it? It is a beautiful field.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.