determine the constant (s) and the variable (s) in each algebriac expression. complete

Answer:
1. Constant: 9 and 5
Variable: p
2. Constant: 15
Variable: q and r
3. Constant: 6 and 2
Variable: x
4. Constant: 4 and 7
Variable: d
5. Constant: 10 and 4
Variable: x