### 1.2 Rounding & Calculators

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• 9. Classifying Plankton by their Size

Write the length of a copepod plankton in exponential form. Then use the chart to classify the plankton. (See Example 3 and Example 4.)

• Worked-Out Solution

In exponential form, the length of a copepod plankton is

This length falls between So, copepod plankton are classified as meso-plankton.

Comparing Numbers in Exponential Form

See that lies between and write all three in decimal form.

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``` __   __    _____               ______   __   _
\ \\/ //  |  ___||     ___    /_   _// | || | ||
\   //   | ||__      /   ||   -| ||-  | '--' ||
/ . \\   | ||__     | [] ||   _| ||_  | .--. ||
/_//\_\\  |_____||    \__ ||  /_____// |_|| |_||
`-`  --`  `-----`      -|_||  `-----`  `-`  `-`
`-`
```
• 10. Classifying Plankton by their Size

Write the length of the golden algae in exponential notation. Then use the chart to classify the plankton. (See Example 3 and Example 4.)

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```            _____     ______   __   __   ______
____     |  ___||  /_   _//  \ \\/ // |      \\
|    \\   | ||__      | ||     \ ` //  |  --  //
| [] ||   | ||__     _| ||      | ||   |  --  \\
|  __//   |_____||  /__//       |_||   |______//
|_|`-`    `-----`   `--`        `-`'   `------`
`-`
```
• 11. Classifying Marine Viruses by their Size

Marine viruses are a type of plankton. The length of a marine virus is less than 2.0 × 10−7 meter. Write this number in standard decimal notation and describe it in words. Use the chart to classify the virus.(See Example 3 and Example 4.)

• Worked-Out Solution

In decimal form, the length of a marine virus is

This implies that marine viruses are classified as femto-planton.

On average, a drop of seawater contains about 10 million virus particles. Most of the viruses only infect bacteria, and are harmless to plants and animals.

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```  _  __     ___      ______    _____    __   __
| |/ //   / _ \\   /_____//  |  ___||  \ \\/ //
| ' //   / //\ \\  `____ `   | ||__     \   //
| . \\  |  ___  || /___//    | ||__     / . \\
|_|\_\\ |_||  |_|| `__ `     |_____||  /_//\_\\
`-` --` `-`   `-`  /_//      `-----`   `-`  --`
`-`
```
• 12. Amount of Plankton to Feed a Whale

A blue whale eats about 5000 pounds of plankton per day during a 120-day feeding period. How many pounds of plankton does the whale eat in one feeding period? Write your answer in standard decimal notation and in exponential notation. (See Example 3 and Example 4.)

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