**Practice problems for simultaneous equations.**

**Practice problems for conversion of time.**

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Online notes for Math 15, Math for Liberal Arts taught in the Fall 2016 semester at Laney College by Prof. Hubbard.

## Sunday, April 24, 2016

## Monday, April 11, 2016

###
Topics for second midterm

The second midterm will have a take-home section and an in-class section. Some topics may appear in both parts. You are allowed a page of notes, front and back of a regular 8.5" x 11" piece of paper.

**Homework 6 **

** **Interest rates and compounding

Half-life of isotopes

Paying back loans: Amount over life of loan

Playing back loans: Amount per month

Maximum amount you can get as a loan given monthly payment, interest rate and length of the loan

**Homework 7**

Triangles defined by angles

Classification system #1: Largest angle – obtuse, right or acute

Classification system #2: Relations between angles – scalene, isosceles, or equilateral

Triangles defined by side lengths

The triangle inequality

Both classifications by side lengths: Variations on the Pythagorean Theorem

Triangles defined by three points on the plane, one of the points (0, 0)

Distance between points

Both classifications by three points (distance is key for both)

**Homework 8**

Three points on the plane where none is (0, 0)

Finding the slope (*m*) between two points (*x*1, *y*1) and (*x*2, *y*2)

What it means when the slope is undefined: the formula*x* = *k*, some constant value

Point slope formula:*y* – *y*1 = *m*(*x* – *x*1)

*x* and *y* will remain variables
*m*, *x*1 and *y*1 will become constants

Slope-intercept:*y* = *mx* + *b*

**Homework 9**

Tilings of the plane

Interior angle sum for a polygon with*n* sides (*n*-gon): sum = 180(*n* – 2)°

Regular angle sum for a polygon with*n* sides (*n*-gon): = 180(*n* – 2)°/*n* = (180–360/*n*)°

Coin problems
## Saturday, April 9, 2016

## Special posts

## About Me

## Labels

The second midterm will have a take-home section and an in-class section. Some topics may appear in both parts. You are allowed a page of notes, front and back of a regular 8.5" x 11" piece of paper.

Half-life of isotopes

Paying back loans: Amount over life of loan

Playing back loans: Amount per month

Maximum amount you can get as a loan given monthly payment, interest rate and length of the loan

Triangles defined by angles

Classification system #1: Largest angle – obtuse, right or acute

Classification system #2: Relations between angles – scalene, isosceles, or equilateral

Triangles defined by side lengths

The triangle inequality

Both classifications by side lengths: Variations on the Pythagorean Theorem

Triangles defined by three points on the plane, one of the points (0, 0)

Distance between points

Both classifications by three points (distance is key for both)

Three points on the plane where none is (0, 0)

Finding the slope (

What it means when the slope is undefined: the formula

Point slope formula:

Slope-intercept:

Tilings of the plane

Interior angle sum for a polygon with

Regular angle sum for a polygon with

Coin problems

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- 100 coins
- all factors
- angles and sides
- area of a triangle
- binary
- biographies
- bitwise operators
- classification of three vertex triangle
- classification of triangles
- coin problems
- compound interest
- computer science
- conditional probability
- Consumer Price Index
- contingency tables
- corrections
- decibel and bel scale
- decimal
- decimals
- distance
- divisibility
- effective interest rates
- Finding the square root of any number
- five number summary
- Fractional part of a day
- fractions
- geometry
- half life
- Heron's formula
- hexadecimal
- homework answers
- Important class dates Fall 2016
- inclusion-exclusion rule
- interest and loans
- linear equations
- logarithms
- logic
- Math history.
- metric system
- numbers and representation
- old school
- order of operations
- outliers
- overflow
- percents
- Polish notation
- powers of 10
- practice
- practice problems
- prime factorization
- prime numbers
- probability
- probability based on contingency tables
- Pythagorean theorem
- regular polygons
- repeating decimals and fractions
- Richter scale
- Roman numerals
- rounding
- scales based on powers of 10
- scientific notation
- scientific notation notes
- set theory
- significant digits
- simultaneous equations
- slope
- square roots
- statistics
- syllabus
- three dimensional geometry
- tilings of the plane
- time
- triangle inequality
- truth tables.
- underflow
- Venn diagrams
- weights and measures
- z-scores