Variables

Which is the variable in the following expression: 4 + p

Which is the variable in the following equation: k - 9 = 5

Which is the variable in the following equation: $15\div3=h$ 

Which is the variable in the following expression: $5t\ -2$ 

Which is the variable in the following equation: $9-2=\ 5y$ 

 $5p\ -\ m\ +6$  

How many variables are in the following expression:

 $2m^2+m-2y$  

How many variables are in the following expression:

 $d^2+d-2d^3$  

How many variables are in the following expression:

 $d+dm\times-2$  

How many variables are in the following expression:

 $d+dm\times-2$  

How many variables are in the following expression: