Question

In a certain triangle, the longest side is 1 foot longer than the second longest

side, and the second longest side is 1 foot longer than the shortest side. If the
perimeter is 21 feet, how many feet long is the shortest side?*

Answer 1

This means that the isotope of silicon with a mass number of 28 is by far the most common of these three isotopes.

Explanation:

The abundance of Si-28 is 92.23%. Si-29 is 4.68% and Si-30 is 3.09%.