Concept explainers
To write and graph:
An equation giving the distancey (in feet) that the robot after x weeks. Use the graph to estimate how quickly the robot could reach the end of the tunnel?

Answer to Problem 20E
Our required equation would be
Therobot will reach the end of tunnel after 21 minutes.
Explanation of Solution
Given:
In 2002, a robot explored a tunnel 210 feet long inside the Great Pyramid inEgypt. The robot could travel about 10 feet per minute.
Concept used:
We know that slope-intercept form of an equation is
Calculation:
Let x represent number of minutes and y represent distance in feet.
We have been given that robot could travel about 10 feet per minute, so total distance traveled in xminutes would be
The distance inside tunnel left after xminutes would be total length of tunnel minus
Therefore, our required equation would be
Upon graphing our given equation, we will get our required graph as shown below:
Upon looking at our graph, we can see that at
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