There are four 4th grade classes at Castle Elementary School. There are 19 students in each class. Each student's science fair project will be on display in the cafeteria, The science teacher wants no more than 6 projects displayed on each table. How many tables are needed to display all the projects? D A 12 B 13 C 14 D 23 E 76​

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.