# math

Write the number in scientific notation.

89,000,000,000

A 4-minute egg is cooked for what fraction of an hour? (1 hour = 60 min)?

4 7/9+ 5 2/9

Erika spent 5/6 hr on her computer visiting the history channel and the discovery channel websites. She spent 1/5 hr at the history channel website. How many hours did she spend at the discovery channel website?

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3. 👁 186

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👩‍🏫
Ms. Sue
2. 8.9*10^9

1/15 of an hour

90/9

19/30

x=900

72

\$17.28

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4. Thanks are any of them right?

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👩‍🏫
Ms. Sue

1. 8.9 *10^10

2. 4/60=1/15

3. 10

4.38/60

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7. Yes!
Note that answer 4 could be reduced to 19/30 hours.

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