Plz help me I'm begging you only good at math I need to pass this help me pls!?

Find the given elements if matrix d:

What is the slope of a line that is perpendicular to y = 3x + 1

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?