Open Up - Grade 8 - Mathematics - Unit 5 - Lesson 9

On the first day after the new moon, 2% of the moon's surface is illuminated. On the second day, 6% is illuminated. Based on this information, predict the day on which the moon's surface is 50% illuminated and 100% illuminated.

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8.F.4

On the first day after the new moon, 2% of the moon's surface is illuminated. On the second day, 6% is illuminated. The moon's surface is 100% illuminated on day 14. Does this agree with the prediction you made?

• Yes
• No

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8.F.4

On the first day after the new moon, 2% of the moon's surface is illuminated. On the second day, 6% is illuminated. Is the percentage illumination of the moon's surface a linear function of the day?

• Yes, it is a linear function.
• No, it is not a linear function.

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8.F.4

In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters.What is the volume of 1 marble?

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8.F.4

In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters.How much water was in the cylinder before any marbles were dropped in?

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8.F.4

In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters.What should be the height of the water after 13 marbles are dropped in?

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8.F.4

In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters.Is the volume of water a linear relationship with the number of marbles dropped in the graduated cylinder? If so, what does the slope of the line mean?

• The slope of the line is the Volume.
• The Slope is not the volume and is instead the height.
• The Slope is not the volume and is instead the number of marbles.

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8.F.4

In science class, Jada uses a graduated cylinder with water in it to measure the volume of some marbles. After dropping in 4 marbles so they are all under water, the water in the cylinder is at a height of 10 milliliters. After dropping in 6 marbles so they are all under water, the water in the cylinder is at a height of 11 milliliters.How much water was in the cylinder before any marbles were dropped in?

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8.F.4

For a certain city, the high temperatures (in degrees Celsius) are plotted against the number of days after the new year. Based on this information, is the high temperature in this city a linear function of the number of days after the new year?

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8.F.4