If you take a mattress off of a hospital bed, you'll notice several hinges that divide the bed into sections. These provide the bed with the flexibility that allows you to put the head of the bed up or elevate the feet.
When applying a vest restraint, you would tie the knot to the upper portion of the bed frame. This allows the restraint to move with the resident if you were to raise or lower the head of their bed. If you attempted this and it was tied further down on the bed, on a place that does not move up or down when the bed moves, it could potentially suffocate the resident.
Always remember to tie restraints to the BED FRAME under the mattress rather than the side rails. If tied to the side rails, the resident could be injured when you lower the side rails. It also leaves greater opportunity for the resident to fall out of the bed and strangle themselves.
Calculating the percentage of a meal eaten is more of an art than an exact science. An easy way to do it is to divide the plate into 4 sections, then assess each section individually. If about half of the food in one quadrant is eaten, it's around 10% (well really it's 12.5 but I don't feel like walking around with a calculator when I do meal intakes), and if all of it is eaten it's 25%. You then add them all up to get the total. Doesn't quite work if they only had 1 or 2 things on their plate.
Most of the containers used to hold liquids are "standardized." Small, slender glasses are ~120cc. The slightly thicker ones are ~240cc. If half of a small glass was drunk, divide that number by half, etc. They usually go in increments of 60cc. If you want to be completely accurate, you measure what is left over and subtract from what the person had to begin with. Eyeballing it is a lot less accurate.