According to a survey, the probability that a randomly selected worker primarily rides a bicycle to work is 0.792. The probability that a randomly selected worker primarily takes public transportation to work is 0.071.

(a) What is the probability that a randomly selected worker primarily rides a bicycle or takes public transportation to work?

(b) What is the probability that a randomly selected worker primarily neither rides a bicycle nor takes public transportation to work?

(c) What is the probability that a randomly selected worker does not ride a bicycle to work?

(d) Can the probability that a randomly selected worker primarily walks to work equal 0.25? Why or why not?