### 1.1 Order of Operations & Formulas

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• Math Help

Some people view mathematics as simply a collection of formulas that need to be memorized. This book does not take this view. There are, however, some formulas that are used so commonly that it saves time to memorize them. The area of a rectangle and the area of a circle are two such formulas.

When you are using any formula, be sure to write the units of measurement. This process is called unit analysis. It enables you to tell whether the units you are using make sense in the context of the problem. Here is an example.

• Consumer Suggestion

Ceramic tile is well known for its durability. Many people and companies install ceramic tile as flooring because it is abrasion, stain, and impact resistant.

Do you need to hire a contractor to install ceramic tile? The answer is, "Probably not."

Visit this Ceramic Tile Installation Guide for easy to understand instructions for installing ceramic tile.

You can also use a search engine to find many home improvement videos. Here is a link for a video on how to install ceramic tile in a bathroom.

• Checkpoint Solution

One room is 8.5 feet by 8.5 feet. The other room is 9 feet by 10 feet. Start by finding the area of the two rooms.

The two rooms have a combined area of 162.25 square feet. Each tile is one square foot and 20 extra tiles are required. So, you should order at least 183 tiles.

1. Each box has 12 tiles. Because you should order 16 boxes.
2. Each tile is \$7.65 and there are 12 tiles per box. The total cost for 16 boxes is

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``` _____     __   __    ______     ___     _    _
|  __ \\   \ \\/ //  /_   _//   / _ \\  | || | ||
| |  \ ||   \ ` //     | ||    | / \ || | || | ||
| |__/ ||    | ||     _| ||    | \_/ || | \\_/ ||
|_____//     |_||    /__//      \___//   \____//
-----`      `-`'    `--`       `---`     `---`

```
Cody (moderator)1 decade ago |
You're welcome. We're glad you like the book.
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Guest   1 decade ago |
i am new to this. this is pretty cool book tho thanks for letting us try it out bro
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Ron Larson (author)1 decade ago |
Thanks. The entire text will be searchable on Google and Bing, as well.
1
Guest   1 decade ago |
Very nice feature
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Ron Larson (author)1 decade ago |
Later in the book, if you forget one of the "common area formulas", you can use the Search feature at the top of the page. Search for "Area Formulas" and select the first response (page 5).
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