What 'non instrument' did Tchaikovsky use in his 1812 overture?*

To make an etching the artist first coats the entire printing plate with an acid-resistant substance called a made from beeswax, asphalt, and other material. the artist then draws on the coated plate with an etching needle exposing the metal. next the plate is dipped in the plate is removed, the waxy coating removed, and the plate is cleaned, inked and printed.

Which rule of composition applies to portraits? a. lead the eye the eyeline rule c. the rule of odds d. use of lines e. rule of thirds

What is the quotient? 2m+4/8 ÷ m+2/6