Question

The number of seconds ?(?) that a traffic light stays yellow is a function of the width w, in feet, of the crossing street. (In other words, when the crossing street is wider, the traffic light needs to stay yellow longer.)

a. Explain the meaning of the statement ?(60) = 5. Include units. Pay careful attention to which variable is the input and which is the output in this function. (1 points)

b. What are the units of ? ᇱ(?)? Again, pay close attention to which variable is the input and which is the output; consider which values would be in the denominator and which in the numerator when calculating a rate. (1 points)

c. Explain the meaning of the statement ?′(60) = 0.05. Include units. Be as specific as possible. (2 points)

d. Use the information in parts (a) and (c) to estimate ?(64). (3 points)

Answer 1