When i double my number add four and divide by two

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.

Which shows the pre image of triangle xyz

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.