A banquet hall charges a fixed rate of $50, plus a cost of $15 per person. Which equation models this relation, where C is the total cost, in dollars, and n is the number of people attending?

Can someone me with this problem i don't understand i need

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 of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?