Joan is h cm tall. gill is 3 cm shorter than joan. write down gill's height in terms of h
i also continue to get these wrong and again i have a maths exam and don't know how to compete these no matter how much i have tried.
you if you me this would be much

Joan  = H 
so to get Gill's height subtract 3
Gill's height = H - 3

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.