Whales can withstand extreme atmospheric pressure changes because their bodies are flexible. Their rib cages and lungs can collapse safely under pressure. Sperm whales can hunt for squid at depths of 7000 ft or more. The function P, given by P(d) = 1/33 d + 1, gives the pressure, in atmospheres (atm), at a given depth d, in feet, under the sea.

(a) Graph P.
(b) Find P(0), P(33), P(1000), P(5000), and P(7000).