Which of the following sets of ordered pairs represents a function?
a. {(-12,8), (-15,8), (-5,-8), (-12,-8)}
b. {(8,-9), (-8,-5), (8,-7), (-8,-6)}
c. {(13,-3), (13,0), (13,-1), (13,-1)}
d. {(-9,8), (-5,-8), (-7,8), (-6,-8)}

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below. trans typ./ check no. date description of transaction payment/ debit deposit/ credit (+) balance 1,200 00 324 10/6 miller's food market 45.87 45 87 groceries 1,154 13 325 10/7 cyber center computer outlet 218.59 218 59 monitor 935 54 326 10/9 sandy's beauty salon 30.00 30 00 haircut and styling 900 59 deposit 10/10 paycheck 621.33 621 33 1,621 92 evaluate leslie's check register. a. leslie did a good job. everything is correct. b. the final balance is wrong; she did not add everything correctly. c. leslie should have written debit instead of deposit for the transaction type. d. leslie switched the debit and credit columns.