Quinn used compensation to find the product of 37x4. first, she found 40x4=160. then she adjusted that product by adding 3 groups of 4 to get her final answer of 172. what did she do incorrectly?

The first step is correct. 37 can be approximated to 40 so that multiplication becomes easier. The second step is also correct. 3 groups of 4 is 12. The mistake is in adding the product to 160. 37 was approximated to 40 and so the product is more than the actual answer. The correct answer should naturally be less than 160. To find the correct answer, we should subtract 12 from 160. So the right answer is 160 - 12 = 148.

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.