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Day Problems

Find each percent of change. Describe the percent of change as an increase or decrease. If necessary, round to the nearest tenth.

1. 4 ft. to 5 ft. 2. 12 m to 9 m

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Find the greatest possible error for the measurement.

3. 56.38 g

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Find the minimum and maximum possible areas for rectangles with the following measured areas.

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4. 4 cm x 6 cm Find the percent error of the measurement.

5. 2 cm

5.1 Interpreting, Sketching, and Analyzing Graphs • You can use a graph to show the relationship between two variables.

– Ex. you can use a graph to show how a quantity changes over time.

Interpreting Graphs

• One student walks and takes a bus to get from school to home each day. The graph shows the student’s commute by relating the time the student spends commuting and the distance he travels. Describe what the graph shows by labeling each part.

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Walking (Distance increases slowly.) Waiting for the bus.

Taking the bus (Distance increases quickly.)

Time

Sketching a Graph

• A plane is flying from New York to London. Sketch a graph of the plane’s altitude during the flight. Label each section.

A Trip to London

Cruising Altitude Circling waiting for a runway.

Landing in London.

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Taking off in NY

Time

Analyzing Graphs

• A car travels at a steady speed. Which graph could you use to show the speed of the car? Which could you use to show the distance it has traveled? Explain.

1.

2.

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Time

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Time

Analyzing Graphs

• Graph 1 indicates a quantity that does not change with time.

– Could use it to indicate a car going at a steady speed.

• Graph 2 shows an increase over time.

– Could use it to indicate the distance a car travels at a steady speed over a given amount of time.

More Practice!!!!

• Textbook p. 238 #1 – 11 all.

• Homework – Worksheet 5.1