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Laabri

Open Up - Grade 8 - Mathematics - Unit 7 - Lesson 14

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"Source: Open Up Resouces (Download for free at openupresources.org.)"

Asemmisa {{asɛmmisaAhyɛnsode}}
1.

Evaluate each expression. Use scientific notation to express your answer.

(1.5⋅10^{2})(5⋅10^{10})

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2.

Evaluate each expression. Use scientific notation to express your answer.

\frac{4.8⋅10^{-8}}{3⋅10^{-8}}

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3.

Evaluate each expression. Use scientific notation to express your answer.

(5⋅10^{8})(4⋅10^{3})

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4.

Evaluate each expression. Use scientific notation to express your answer.

(7.2⋅10^{3})\div(1.2⋅10^{5})

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5.

How many bucketloads would it take to bucket out the world’s oceans? Write your answer in scientific notation.

Some useful information:

  • The world’s oceans hold roughly 1.4⋅10^{9} cubic kilometers of water.

  • A typical bucket holds roughly 20,000 cubic centimeters of water.

  • There are 10^{15} cubic centimeters in a cubic kilometer.

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6.

The graph represents the closing price per share of stock for a company each day for 28 days.

What variable is represented on the horizontal axis?

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7.

The graph represents the closing price per share of stock for a company each day for 28 days.

In the first week, was the stock price generally increasing or decreasing?

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8.

The graph represents the closing price per share of stock for a company each day for 28 days.

During which period did the closing price of the stock decrease for at least 3 days in a row?

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9.

Write an equation for the line that passes through (-8.5,11) and (5,-2.5).

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10.

Explain why triangle ABC is similar to triangle CFE.