Judy hiked down the North Rim of the Grand Canyon until she was at an elevation of 1,245 meters below sea level. She stopped to rest, and then hiked down 475 meters more. What elevation is she at if she hiked 544 meters up?

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.