# Homework Help Videos

Nature of Mathematics, MATH 120, Matthew Weathers

## Chapter 2

Problem 5b - Egyptian Multiplication

Problem 9 - Using Pythagorean Theorem (ladder & building).

## Chapter 3

Several Examples - Determining if an argument is valid or invalid (includes problem #3 and #7)
Problem 13 - Determining if an argument is valid or invalid

Problem 15 - Determining if an argument is valid or invalid

## Chapter 4

Primes Proof - A proof that the number of primes is infinite.

## Chapter 7

Chapter 7 Lecture - All 35 minutes, in case you missed it.

## Test 1 Study Guide

Study Guide for Test 1 - A description of what kinds of problems will be on the test, plus a review of some examples.

## Chapter 10

Several Videos - Showing how to do various problems in Chapter 10.

Ch10_11_Examples.pdf - A PDF file with a copy of some problems from Chapters 10 and 11. These are "Screen Notes" - problems I did in class on the screen.

Ch10_11_Worksheet_Answers_v3.pdf - A PDF file with the answers to a worksheet we did in class.

## Chapter 11

Chapter 11 - Converting
Converting a Mayan common number to Base 10

Chapter 11 - Mayan Solar Numbers
Converting Base 10 to Mayan solar

Chapter 11 - Addition of Mayan numbers

Chapter 11 - Using a Calculator
Extra: Division on a calculator (&Outtakes)

Chapter 11 Online Lecture - most of the lecture for Chapter 11 in several video segments.

## Chapter 13

Chapter 13 - Exponents

## Test 2 Study Guide

Study Guide for Test 2 - A description of what kinds of problems will be on the test, plus a review of some examples. Chapters 8 to 13.

## Chapter 14

Basic Algebra Strategy - for solving for X

Counting Bills - Like Problems 23-28

Antifreeze Problem - Like Problems 17 and 18

## Chapter 17

Example 1 - sin & cos. Two ways of doing the same problem.

Example 2 - Another example

## Chapter 18

Problem 2b - Distance to sun

Problem 4b - Average speed of rock falling

Problem 7d - How fast is a rock falling?

## UNUSED: Chapter 20

Slope - Determining the slope of a line from a graph

Writing Equation - Writing equations of lines from a graph

Graphing a line - Drawing a graph from an equation

Perpendicular Line - Equation of a perpendicular line

## Test 3 Study Guide

Study Guide for Test 3 - Chapters 14 to 20

Note:You can ignore Chapter 20 - you will not be tested on that chapter.

## Chapter 22

Example 1 - Mean, Median, and Mode from List.

Example 2 - Mean, Median, and Mode from Chart.

## Chapter 24

Repeating Decimals to a Fraction

Sum of a Geometric Series

## Chapter 26

Limit of a Series

Calculus - Area Under a Curve