The cost per passenger is , where is the ground speed(air speed wind).

(a)

Use a graphing utility graph the function .

Graph of the function is :

.

(b)

Create a table.

Choose values for and find the corresponding values for . 

(c)

Find to the nearest 50 mi/hr, the ground speed minimizes the cost per passenger. 

Observe the graph of the function :

The ground speed minimizes the cost per passenger to the nearest mi/hr is mi/hr.

(a)

Graph of the function is :

.

(b)

Table:

(c)

The ground speed minimizes the cost per passenger to the nearest    mi/hr is mi/hr.