I need help i keel putting in the correct answer and it says it wrong

(write as unit rate) 12 meters in 2.8 seconds =

Abacteria population is tripling every hour. by what factor does the population change in 1/2 hour? select all that apply

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?