Determine Whether Each Function Is Continuous or Discontinuous

Essay

Determine whether each function is continuous or discontinuous. Explain your choice.(a) Postage charges to send a letter by first class mail.(b) The altitude of an airplane as a function of the time it has been in the air.(c) The temperature of an oven as it is run through its self cleaning cycle.(d) The number of people waiting in a queue for a bank teller.