Which fraction in this list are greatest than 1/2? 5/6,4/8,3/4,9/20

Which of these choices show a pair of equivalent expressions?

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

You dug a hole that was 8 feet deep. after taking a short break, you dug down 3 more feet in the same hole. when finished digging, a tractor accidentally filled the hole with 4 feet of dirt. how deep is your hole now?