Nena Adds Her Grades For The First Quarter And Obtain 18x?+ 39x + 18. What Is Her Average Grade If S

Nena adds her grades for the first quarter and obtain 18x² + 39x + 18. what is her average grade if she has 3x + 2 subjects?

a.6x+9
b.6x-9
c.3x+9
D.3x-9

 

A.6x+9

d ko alam pano mag send ng picture kaya walang explanation basta yan ang sagot