CCSS.Math.Content.8.F.B.4

An antibiotic is introduced into a colony of 12,000 bacteria during a laboratory experiment. The colony is decreasing by 14.9% per minute. Which function can be used to model the number of bacteria in the colony after x minutes?

• f(x) = 12000(1 + 14.9)^x
• f(x) = 12000(1 - 14.9)^x
• f(x) = 12000(1 + 0.149)^x
• f(x) = 12000(1 - 0.149)^x

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CCSS.Math.Content.8.F.B.4

Find the slope from the table.

• 3
• -3
• 20
• Not a constant slope/Non-Linear

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CCSS.Math.Content.8.F.B.4

Find the slope of the line that passes through the points (2, 4) and (6, 12)

• 1/2
• -1/2
• 2
• -2

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CCSS.Math.Content.8.F.B.4

What is the algebraic equation for this table?

• y = 480x
• x = y/480
• x + 480 = y
• 480 - x = y

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CCSS.Math.Content.8.F.B.4

There were 417 cell phones sold at an electronics store in January. Since then, cell phone sales at this store have increased at a rate of 3.75% per month. At this rate of growth, which function can be used to determine the monthly cell phone sales x months after January?

• f(x) = 417(3.75)^x
• f(x) = 417(0.0375)^x
• f(x) = 417(1.0375)^x
• f(x) = 417(1.375)^x

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CCSS.Math.Content.8.F.B.4

Use the line of best fit to approximate rate of change relative to the scatter plot above.

• 7/5

• 5/7

• -7/5

• -5/7

Tags

CCSS.Math.Content.8.EE.B.5

CCSS.Math.Content.8.F.B.4

If Gold's Gym is looking to buy 30 TVs, how much will each one cost?

• 400
• 750
• 1250
• 0

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CCSS.Math.Content.8.F.B.4

Graph. y = 2/3x - 3

• 
• 
• 
• 

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CCSS.Math.Content.8.F.B.4

Which equation best represents the relationship between x and y in the table shown?

• y= 5x+5

• y=1/5x+5

• y=15x+5

• y=10x+5

Tags

CCSS.Math.Content.8.F.B.4

What is the y-intercept of the line graphed?

• 3

• 4

• -3

• 4/3

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CCSS.Math.Content.8.F.B.4