The non-negative root of a number is called A. rational number
B. irrational number
C. principal root
D. square root​

A non-negative root of a number is called Square Root

11/2.2 = 5 inches for the length 8.5/2.2= 3.86 inches for the width

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.