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-Pencils were first used in 1662.
-Graphite is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure.
- HB is a graphite hardness/grading scale: the higher the number next to H, the harder and lighter/less dark the pencil lead is.
- The H stands for “hard.”
The expression
is a product expression
The denominator of the simplified fraction is 3n -2
<h3>How to determine the denominator?</h3>
The expression is given as;

Divide the first fraction by 2/2

Evaluate the above product

The above fraction is a simplified fraction of
, and the denominator is 3n - 2
Hence, the denominator of the simplified fraction is 3n -2
Read more about fractions at:
brainly.com/question/15215592
Gamma rays
Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies associated with its photons. Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.