How can u tell if a function is a "one to one function" ???? so confused as to what this even means?

one-to-one means that each output is associated with exactly one input. For example, y=x^2 would not be one-to-one because the input values (the x's) share y values (e.g. 1 and -1 share 1). When looking at a graph, it is like using the vertical line test to determine if an equation is a function, only you are doing a "horizontal line test." Simply, the x values have to have different y values. Any parabola, like f(x)=x^2+8x+1, is not one-to-one.

What happens when you get your mac air hinges repaired?

both my hinges broke,and my screen no longer functions,what are the steps they take to repair it?Do they remove or check your hard drive ?

Tetanus from a scrape?

I live in an apt in NYC. Scraped the top of my foot with my bike pump's bottom (it's made of metal). The metal isn't rusty, just a little dusty. The scrape drew some blood, and within a few minutes I washed the scrape with soap and put some bacitracin on it. Is a tetanus booster necessary IMMEDIATELY?

Is Israeli treatment of Palestinian prisoners in accordance with the international law?

Its been stated that at present Israel are holding over 9,000 prisoners many young children imprisoned for throwing stones at the IDF This must be against human rights . Do Israel, as occupiers, have the right to imprison anyone, not to mention the 1.5 million imprisoned in the Gaza strip As for Gilad Shalit he is just a prisoner of war and when a satisfactory peace deal is agreed by both parties he will be released . He will be a major factor when they finally sit down and try to arrange some kind of deal

MTG Divine Deck Cost?

I recently managed to get this deck in an MTG value pack that came with two decks and a booster, but was worth only $10.00. I didn't get the Demonic deck in the pack, but still got the Divine one, including all of its cards. Can anyone tell me an approximation of how much they think this deck by itself is worth? (It also includes the foil Akroma, Angel of Wrath.)

Dog 1 and 1/2 year old bloody liquid stool ?

My dog (pitbull terrier) has all her shots and was even given a parvo booster shot a little over 2 weeks ago. She was around puppy's who died of parvo after which she was taken to the vet checked on and was updated on her vaccinations. Last night around 5 am she started having normal diarrhea this morning her first stool was basically completely liquid it was blood colored and smelled like blood. She vomited this morning 3 times followed by her first bloody diarrhea at which point I took her immediately to the vet. She was given a parvo and blood test both of which came back as negative. I have all kinds of medications antibiotics to give her. But I and the vet are baffled what is this? Has any1 experienced something like this? I also have a male (bully pitbull) who is one year who is showing no signs at all the are separated and he is in the Kennel until I finish rebleaching the yard and house I've already spent 500$ and I have no real answers on what this is! I just want my baby to be ok both of them! Any information would be great!

Prove that x is continuous?

A function f:R-->R is said to be additive if f(x+y) = f(x) + f(y) for all x,y in R. Prove that if f is continuous at some point x_0, then it is continuous at every point of R