Question

Tyler tutors at a neighborhood community center after school. He charges $20 for an hour-long tutoring session. The function P(t) represents the total amount, in dollars, that Tyler earns for providing t tutoring sessions.
What is the range of P(t)? Real or Whole

Answer 1

P(t) = 20t. Since t is the number of sessions, t is a whole (nonnegative integer): 0,1,2,...

So the range is the nonnegative multiples of 20: {0, 20, 40, 60, ...}. That is a subset of the whole numbers (not all real numbers).