Which of the following shows 2.1851 rounded to the nearest tenth?

a. 2.1
b.2.185
c.2.19
d.2.2

The tenth is the first number immediately after the decimal point.
In this case, it is 1. Because there is an 8 after, and 8 > 5, you would round up, leaving you with 2.2.

D is the correct answer. Hope this helps!

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.