A company making ceramic coffee cups finds that it can sell x cups per week at p dollars each, according to the formula p(x) = 40 − 0.2x. If the total cost to produce and sell x coffee cups is
C(x) = 3x + 40, and the revenue function R(x) = x · p(x) is given by the number of cups sold times the
price per cup, find and simplify the profit function, P(x) = R(x) − C(x).

Me because some of question i don’t understand

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 line is parallel to the line that passes through the points (2, –5) and (–4, 1) a. y=-x+5 b. y=-2/3x+3 c. y=2/3x-2 d. y=x+5