Mr. Vasquez is 30 years older than his daughter, Gina. Which statements are true? Select all that apply.

Gina's age is not a variable. She is 30 years old.
Gina's age is a variable. You can use g to represent her age.
Mr. Vasquez's age is a variable. You can use m to represent his age.
Mr. Vasquez's age is not a variable. He is 30 years old.
The difference between Mr. Vasquez's age and Gina's age is a variable. You can use a to represent the difference.
The difference between Mr. Vasquez's age and Gina's age is not a variable. The difference is 30 years.