Is there a quick way to tell if the total is going to be even or odd? pls be quick

Which of these people has balanced their checkbook correctly? oa. gary: the balance in his check register is $500 and the balance in his bank statement is $500. b. gail: the balance in her check register is $400 and the balance in her bank statement is $500. c. gavin: the balance in his check register is $500 and the balance in his bank statement is $510.

What is the value of x in the this question ?

For which rational expression is -2 an excluded value of x