In terms of medicine, what is the difference between the standard of care and the standard of practice?

I am not sure how to even start this word problem. The word problem is this: The area of the square base is 12 more than its perimeter. Find the length of a side. I am not sure if I need to use the area and perimeter formulas to start this problem or if I just need to use one of the formulas. ...

Iam a newbie to target shooting and was wondering if someone could please help me out in regards to target dimensions for open and aperature sights. I make my own targets but need to know what the dimensions for the "Black" on a standard 10 ring target at ranges of 100yards, 200yards, 300yards etc.

I am about to install a second bathroom and want two showers to work at the same time. I am replacing all plumbing but there is only 15mm feed to flat. What type of boiler etc is needed to run two showers and washing machine at the same time?