2018 STAAR Test Re-Enact!

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8.7A

Students in a science class investigated how the speed of sound changes with the air temperature outside. The data are shown in the scatterplot. Based on the scatterplot, what is the best prediction of the speed of sound when the air temperature is 50°C?

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8.5D

Reorder the following from greatest to least.

• -1

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8.2D

Jerry has a new job and earns a salary of $45,000. Victoria has a new job and earns a salary of $54,000. Jerry will receive a salary increase of $2,500 per year, and Victoria will receive a salary increase of $1,500 per year. Which equation can be used to find x, the number of years it will take Jerry to earn the same salary as Victoria?

• 45,000x + 2,500x = 54,000x + 1,500x

• 45,000x + 2,500 = 54,000x + 1,500

• 45,000 + 2,500x = 54,000 + 1,500x

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8.8A

• 1.9 mi

• 2.3 mi

• 1.6 mi

• 1.4 mi

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8.7C

A relation contains the points (1, 2), (2, −1), (3, 0), (4, 1), and (5, −1). Which statement accurately describes this relation?

• The relation represents y as a function of x, because each value of x is associated with a single value of y.

• The relation does not represent y as a function of x, because each value of y is associated with two values of x.

• The relation represents y as a function of x, because one value of y is associated with two values of x.

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8.5G

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8.6A

Julie started with 20 pieces of gum and gave away x pieces. Conrad started with 35 pieces of gum and gave away twice as many pieces as Julie did. How many pieces of gum did Julie give away if they had the same number of pieces of gum left? Which equation represents the situation?

• 20-x = 35-2x

• 20-2x = 35-x

• 20-35 = x

• x = 25x - 35x

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8.8C

• 20-35 = 2x

• -2x = 25x - 35x

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8.8C

Julie started with 20 pieces of gum and gave away x pieces. Conrad started with 35 pieces of gum and gave away twice as many pieces as Julie did. How many pieces of gum did Julie give away if they had the same number of pieces of gum left?

• 15

• 10

• 7

• 8

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8.8C