Please help and show work

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

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 value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12