Are section leaders sposed to there section with music that they are struggling with

Identify the expression 8 + 8 + 8 + 8 as a numerical expression or a variable expression. for a variable expression, name the variable.

Who is depicted in the image below?

The opening section sounds marchlike, with accented beats and alternations between instrumental groups. eventually, a total change of character marks a short, new section. at approximately which time interval from the beginning does this appear?