Help with this question plz

Which table represents a linear function? i'll give brainliest to first answer ^'^

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,