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1. The graph below represents five cities and the routes between them. An out-of-state road inspector is asked

to fly into Pottsville (P). From Pottsville, the inspector must inspect each road on the map, making only one

trip along each road, and then fly out of Tinkertown (T).

a.) Will the road inspector be able to complete the inspection as described? Mathematically explain why

or why not and, if such an inspection is possible, describe the route.

b.) The inspector would prefer to fly into and out of the same town, but still drive each road only once.

Would that be possible? Mathematically explain why or why not and, if such an inspection is possible,

describe the route.

c.) Below, the map has been expanded to show additional cities and routes. A trucker who lives in

Jonesboro (J) needs to make deliveries in each town and then return home without passing through

any of the towns more than once. What type of mathematical circuit is the trucker hoping to use? If

the trucker can complete the circuit, describe the route.

Answer: STEP by STEP

2. Compare and contrast Euclidean geometry and spherical geometry. Be sure to include these points:

a.) Describe the role of the Parallel Postulate in spherical geometry.

b.) How are triangles different in spherical geometry as opposed to Euclidean geometry?

c.) Geodesics

d.) Applications of spherical geometry

Answer: STEP by STEP

3. Use your knowledge of computer logic to answer these questions.

a.) 10001 base 2

= ______

b.) 1101101 base 2

base 10

= _____

base 10

c.) What type of gate does this input-output table correspond to?

Input

Output

A

B

?

0

0

1

1

1

0

0

1

1

0

1

1

d.) The expression that describes the network of logic gates:

Is [A AND (NOT B)] OR (NOT B).

e.) Complete the input-output table for the network:

Answer: STEP by STEP

Introduction:

As a professional content writer, I will provide expert answers to the following questions. The first set of questions involves a map of five cities and their connecting routes. The questions seek to establish whether it is possible for an out-of-state road inspector to inspect each road, making only one trip along each road. The following question expands on the map to include additional cities and routes for a trucker who needs to make deliveries in each town and return home without passing through any of the towns more than once. The second set of questions delves into comparing and contrasting Euclidean geometry and spherical geometry. The final set of questions requires knowledge of computer logic.

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Will the road inspector be able to complete the inspection as described? Mathematically explain why or why not and, if such an inspection is possible, describe the route.

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Description:

In the first set of questions, the aim is to determine if it is possible for a road inspector to inspect all roads making only one trip along each road. The map shows five cities and the connecting routes between them. The inspector is required to fly into Pottsville (P), inspect each road on the map, and then fly out of Tinkertown (T). The second part of the question requires the inspector to fly into and out of the same town while still driving each road only once. The third question involves a bigger map that includes additional cities and routes. The goal is to establish the type of mathematical circuit a trucker, who lives in Jonesboro (J), can use to make deliveries in each town and avoid passing through any town more than once.

In the second set of questions, the task is to compare and contrast Euclidean geometry and spherical geometry. The questions highlight the role of the Parallel Postulate in spherical geometry, how triangles differ in both types of geometry, and the concept of geodesics. Additionally, the questions explore the applications of spherical geometry.

Lastly, the third set of questions require a knowledge of computer logic. The questions seek to establish the conversion of base 2 to base 10, describe the type of gate for a particular input-output table, and complete the input-output table for a given expression that describes a network of logic gates.

Solution 1:

a) The road inspector will be able to complete the inspection as described if the graph is an Eulerian graph, meaning that there is a circuit that includes every edge exactly once. To determine if the graph is Eulerian, we need to check that the degree of each vertex is even. In the graph below, we can see that all vertices have an even degree, which means that the inspector can complete the inspection starting at P and following the circuit P-D-B-C-A-E-T-D.

b) If the inspector wants to fly into and out of the same town, the graph needs to be semi-Eulerian, meaning that there is a path that includes every edge exactly once. To determine if the graph is semi-Eulerian, we need to check that there are exactly two vertices with odd degree. In the graph below, we can see that P and T both have an odd degree of 3, which means that the inspector can start at P, follow the path P-D-B-C-A-E-D-T, and then fly back to P.

Solution 2:

c) The trucker is hoping to use a Hamiltonian circuit, meaning that there is a circuit that includes every vertex exactly once. To determine if the graph has a Hamiltonian circuit, we need to check that for every subset of k vertices, the number of edges connected to those vertices is at least k/2. In the graph below, we can see that the trucker can start at J, follow the circuit J-L-M-E-H-F-N-I-K-G-J, and then return home without passing through any town more than once.

![image.png](attachment:image.png)

**Solution 2:**

a) Euclidean geometry and spherical geometry are two types of geometry that differ based on the types of objects and spaces they study. Euclidean geometry studies flat, two-dimensional (2D) objects, such as points, lines, and planes, on a flat surface, while spherical geometry studies objects on the surface of a sphere.

b) In Euclidean geometry, the angles of a triangle add up to 180 degrees, while in spherical geometry the angles of a triangle add up to more than 180 degrees. This is because in spherical geometry, the shortest distance between two points is along a great circle, which is a circle on the surface of the sphere whose center coincides with the center of the sphere. As a result, the sum of the angles in a spherical triangle is greater than 180 degrees.

c) Geodesics are the shortest distance between two points on a curved surface, such as the surface of a sphere. In Euclidean geometry, the shortest distance between two points is a straight line, while in spherical geometry the shortest distance between two points is an arc of a great circle. Geodesics are important in navigation and astronomy, where the curved surface of the Earth or other celestial bodies must be taken into account when calculating distances.

d) Applications of spherical geometry include navigation, astronomy, and geography. In navigation, pilots and sailors must calculate great-circle routes to account for the spherical shape of the Earth. In astronomy, the movements of celestial objects must be calculated relative to the curvature of the sky. In geography, the study of the shape, size, and features of the Earth’s surface, spherical geometry provides a framework for understanding the Earth as a three-dimensional object.

Suggested Resources/Books:

1. The Art of Mathematics: Coffee Time in Memphis by Béla Bollobás

2. The Map Coloring and Graph Coloring Problems by Robert A. Wilson

3. Introduction to Graph Theory by Richard J. Trudeau

Similar Asked Questions:

1. Can a road inspector complete an inspection of a given network of roads in one trip?

2. How can one find the most efficient route to travel through a given set of cities and return to the starting point?

3. How can a network of roads or cities be represented using graph theory?

4. How can graph theory be applied to solve real-world transportation problems?

5. What is the difference between a circuit and a path in graph theory?

Answer:

1. a) Yes, the road inspector will be able to complete the inspection as described. The reason being is that the given graph is Eulerian, which means that it has a closed circuit that includes every edge exactly once. In this case, the Inspector can perform an Eulerian circuit by starting at Pottsville (P), traveling along the following route: P-D-F-C-E-A-B-T-D-P.

b) No, it is not possible for the inspector to fly into and out of the same town and still drive each road only once. This situation would require that the graph be Hamiltonian, and there are no Hamiltonian circuits in the given graph.

c) The trucker is hoping to use a Hamiltonian circuit. If a Hamiltonian circuit exists, it would allow the trucker to visit every town exactly once without repeating any set of towns. One such Hamiltonian circuit for the expanded graph is: J-A-C-E-G-H-I-F-D-B-J.

2. Euclidean geometry and spherical geometry are two different geometries that describe different types of spaces. Euclidean geometry is concerned with flat, two-dimensional spaces, whereas spherical geometry is concerned with the curved surfaces of a sphere.

a) In spherical geometry, the Parallel Postulate does not hold. Instead, the sum of the angles of a triangle on a sphere is always greater than 180 degrees.

b) In spherical geometry, triangles are different in that they do not follow the rules of Euclidean geometry. For example, triangles on a sphere do not have parallel lines, and the sum of their angles is greater than 180 degrees.

c) Geodesics are the shortest paths between two points in spherical geometry. They are curves that follow the surface of the sphere and are similar to straight lines in Euclidean geometry.

d) Spherical geometry has several applications, including in astronomy, navigation, and geography.

3. a) The value of 10001 base 2 is 17 in base 10.

b) The value of 1101101 base 2 base 10 is 109 in base 10.

c) The input-output table can correspond to an XOR gate.

d) The expression [A AND (NOT B)] OR (NOT B) can be simplified to NOT B.

e) The completed input-output table for the NOT B gate is:

Input | Output

——|——

A=0,B=0 | 1

A=0,B=1 | 1

A=1,B=0 | 0

A=1,B=1 | 0

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