Anumber is multiplied by 2. then that product is multiplied by 5. write to explain how you know what digit is in the ones place of the final product

If the number is a multiple of 2 and 5, it must also be a multiple of 10.

Al multiples of 10 end with a 0 in the ones place.

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.