Math & YOU | 1.2 Rounding & Calculators

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
  
  $0.0012 meter = 1.2 x 10 raised to the -3 meter$
  
  This length falls between $2 x 10 raised to the -4 and 2 x 10 raised to the -3$ So, copepod plankton are classified as meso-plankton.
  
  Comparing Numbers in Exponential Form
  
  See that $1.2 x 10 raised to the -3$ lies between $2 x 10 raised to the -4$ and $2 x 10 raised to the -3$ write all three in decimal form.
  
  $0.0002 < 0.0012 < 0.0020$
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Guest 2 years ago |

0.0002 < 0.0012 < 0.0020

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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
  
  $2 x 10 raised to the -7 = 0.0000002 meter$
  
  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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Guest 6 years ago |

120 days is one feeding period and the whale eats 5000 pounds a day multiply 5000 and 120 to get the amount per period

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Guest 7 years ago |

?

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