The diagonals bisect each other
one hour 55 min
you just need to subtract bout to get the answer
Answer:

Step-by-step explanation:
First, note that

And using the chain rule in one variable

Now remember that the chain rule in several variables sates that

Therefore the chain rule in several variables would look like this.

Answer:

Step-by-step explanation:
I'd assume this is a dice? Please give more information.