How many variable terms are in the expression 3x to the third power Y plus 5X to the second power plus Y + 9

Well, variables are stuff like x and y because they can represent a number. They are variable in an equation. so if you have (3x^3) + (5X^2) + Y+9 then your variables are x X and Y (im assuming the capital X is there and not a typo) if that was a typo and meant to be lowercase, then its just a 2 variable with the x and y