How many variable terms are in the expression 3x3y + 5x2 + y + 9? (Input a numeric value only.)Numerical Answers Expected!Answer for Blank 1:

3
this is because 
[tex] x^{3}y[/tex]
 [tex]x^{2}[/tex]
and
  y
  are all separate variables (also [tex]x^{3} y[/tex] combines into one variable)