An airline wants to survey customers about their overall satisfaction. They take a random sample of 1,000 customers who have flown in the past month and email them a survey. The email also offers those who complete the survey a 25 gift card that can be used almost anywhere.

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.