Grade 8 | Unit 5: Functions and Volume | Mid-Unit Assessment (A)

Tags

8.F.A.1

This graph shows the temperature in Diego’s house between noon and midnight one day. Select all the true statements.

• Time is a function of temperature.

• The lowest temperature occurred between 4:00 and 5:00.

• The temperature was increasing between 9:00 and 10:00.

• The temperature was 74 degrees twice during the 12-hour period.

• There was a four-hour period during which the temperature did not change.

Tags

8.F.B.5

This table shows a linear relationship between the amount of water in a tank and time. Which of these statements is true?

time (minutes)	water (gallons)
0	30
5	20
10	10

• The water in the tank is increasing at a rate of 2 gallons per minute.

• The water in the tank is increasing at a rate of 10 gallons per minute.

• The water in the tank is decreasing at a rate of 2 gallons per minute.

• The water in the tank is decreasing at a rate of 10 gallons per minute.

Tags

8.F.B.4

Elena goes for a long walk. This graph shows her time and distance traveled throughout the walk. What was her fastest speed, in miles per hour?

Tags

8.F.B.5

Lin counts 5 bacteria under a microscope. She counts them again each day for four days, and finds that the number of bacteria doubled each day—from 5 to 10, then from 10 to 20, and so on. Is the population of bacteria a function of the number of days? If so, is it linear? Explain your reasoning.

Tags

8.F.A.1

8.F.A.3

Draw a graph of Andre’s distance as a function of time for this situation: When the football play started, Andre ran forward 20 yards, then turned around and ran 5 yards back. He stood in that spot for 3 seconds, then walked back to where he began. Label the axes appropriately. You do not have to include numbers on the axes or the coordinates of points on your graph.

Tags

8.F.B.5

Two plumbing companies charge money for each hour of work, plus a one-time fee. A Plus Plumbing charges according to this table:

time (hours)	cost (dollars)
1	140
4	320
6	440

Quality Plumbing charges according to this graph. How much does A Plus Plumbing cost for each hour of work, and what is the one-time fee? Explain or show your reasoning. How much does Quality Plumbing charge for each hour of work, and what is the one-time fee? Explain or show your reasoning. Can A Plus Plumbing and Quality Plumbing ever charge the same total for the same amount of time? Explain or show your reasoning.

Tags

8.F.B.4

8.EE.C

8.F.A.2