Which of the graphs represents a function ?

C) would be a function. One way to test if something is a function or not is to do a vertical line test. A vertical line test is where you draw imaginary vertical lines and if it hits the “function” in one particular spot more than once, it is not a function. I suggest you look more into it to help you in the future. I hope this helped :)

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.