How do you subtract a positive and a negative number

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.

Tell whether the two rates form a proportion

Which statement accurately describes how to perform a 90° clockwise rotation of point a (1,4) around the origin?