Staci has 13 pieces of rope, each piece is 5 feet long. what is the least number of pieces that she needs to tie together to make length that is at least 12 yards long?

2.4 pieces of rope
If each peice is 5 feet long and she only needs 2.4 pieces to make 12 yds.

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.