How do you simplify 1/10 ​

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

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?

Which expression is rational? 6. , square root two, square root 14, square root 49