Search and rescue teams work to find lost hikers. Members of the search team separate and walk parallel to one another through the area to be searched. Table 1.7 shows the percent, P, of lost individuals found for various separation distances, d, of the searchers.

(a) Explain how you know that the percent found, P, could be a linear function of separation distance, d. 

(b) Find P as a linear function of d. 

(c) What is the slope of the function? Give units and interpret the answer. 

(d) What are the vertical and horizontal intercepts of the function? Give units and interpret the answers.

Table 1.7

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Separation distance d (ft) Approximate percent found, P 20 40 60 80 100 90 80 70 60 50