### 10.4 Outdoor Sports

<
>
• Math Help

Grade refers to the amount of inclination of a road, trail, railroad track, or other surface (see figure). In some instances, you might see grade called slope or incline. Slope can be calculated using the ratio

Grade is usually listed as a percent. For instance,

Note that the horizontal axis in Example 1 shows each grade as a decimal. As a percent, each grade would be (from left to right)

-60%, -40%, -20%, 0%, 20%, 40%, and 60%.

• A negative grade is "downhill."
• A positive grade is "uphill."
• A zero grade is "level."
• "Large" numbers, such as -60% or 40%, represent grades that are steeper than "smaller" numbers, such as -30% or 20%.

• Consumer Suggestion

If you like to hike, or plan on hiking in the future, you might want to check out backpacker.com, where you can find plenty of useful information about hiking. The site has a wealth of features, including a list of top hiking destinations, a survival guide, and photos from numerous hiking spots.

• Checkpoint Solution

The two speeds fall within the range of the speeds shown in the scatter plot.

These comments are not screened before publication. Constructive debate about the information on this page is welcome, but personal attacks are not. Please do not post comments that are commercial in nature or that violate copyright. Comments that we regard as obscene, defamatory, or intended to incite violence will be removed. If you find a comment offensive, you may flag it.
When posting a comment, you agree to our Terms of Use.

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

```