# Lesson 4

Dividing Powers of 10

### Problem 1

Evaluate:

- \(10^0\)
- \(\frac{10^3}{10^3}\)
- \(10^2 + 10^1 + 10^0\)

### Solution

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### Problem 2

Write each expression as a single power of 10.

- \(\frac{10^3 \boldcdot 10^4}{10^5}\)
- \((10^4) \boldcdot \frac{10^{12}}{10^7}\)
- \(\left(\frac{10^5}{10^3}\right)^4\)
- \(\frac{10^4 \boldcdot 10^5 \boldcdot 10^6}{10^3 \boldcdot 10^7}\)
- \(\frac{(10^5)^2}{(10^2)^3}\)

### Solution

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### Problem 3

The Sun is roughly \(10^2\) times as wide as Earth. The star KW Sagittarii is roughly \(10^5\) times as wide as Earth. About how many times as wide as the Sun is KW Sagittarii? Explain how you know.

### Solution

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### Problem 4

Bananas cost $1.50 per pound, and guavas cost $3.00 per pound. Kiran spends $12 on fruit for a breakfast his family is hosting. Let \(b\) be the number of pounds of bananas Kiran buys and \(g\) be the number of pounds of guavas he buys.

- Write an equation relating the two variables.
- Rearrange the equation so \(b\) is the independent variable.
- Rearrange the equation so \(g\) is the independent variable.

### Solution

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(From Unit 5, Lesson 3.)### Problem 5

Lin’s mom bikes at a constant speed of 12 miles per hour. Lin walks at a constant speed \(\frac13\) of the speed her mom bikes. Sketch a graph of both of these relationships.

### Solution

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(From Unit 3, Lesson 1.)