2018 STAAR (29-42)

A square with a perimeter of 20 units is graphed on a coordinate grid. The square is dilated by a scale factor of 0.4 with the origin as the center of dilation.

If ( x, y) represents the location of any point on the original square, which ordered pair represents the coordinates of the corresponding point on the resulting square?

• $\left(20x,\ 20y\right)$

• $\left(0.4x,\ 0.4y\right)$

• $\left(x+20,\ y+20\right)$

• $\left(x+.04,\ y+.04\right)$

Tags

CCSS.8.G.A.3

Which situation could NOT represent a proportional relationship?

• The number of gallons of water in x barrels with 42 gallons of water in each barrel

• The amount an employee who makes $8.50 per hour earns in h hours

• The weight in x weeks of a puppy that gains 2 pounds per week if its starting weight is 8 pounds

• The cost of purchasing p pounds of bananas for $0.55 per pound

Tags

CCSS.7.RP.A.2D

Triangle RST is translated 6 units to the left and 4 units up to create triangle R'S′T′.

Which rule best describes this transformation?

• $\left(x,y\right)\rightarrow\left(6x,-4y\right)$

• $\left(x,y\right)\rightarrow\left(-6x,4y\right)$

• $\left(x,y\right)\rightarrow\left(x+6,y-4\right)$

• $\left(x,y\right)\rightarrow\left(x-6,y+4\right)$

Tags

CCSS.HSG.CO.A.2

Phil collected data from several of his friends about the number of hours they spent sleeping and the number of hours they spent playing video games on Saturday. He recorded the data in the scatterplot.

Based on the scatterplot, what is the best prediction of the number of hours one of Phil’s friends spends sleeping when the friend spends 1 hour playing video games?

• 9 hours

• 8 hours

• 10 hours

• 7 hours

The dimensions of a rectangular piece of paper are 8.5 inches and 11 inches. Veronica folded the piece of paper along its diagonal.

Which measurement is closest to the length of the diagonal in inches?

• 6.24 in.

• 19.5 in.

• 6.98 in.

• 13.9 in.

Tags

CCSS.8.G.B.8

The amount of water an electric dishwasher uses to wash dishes varies directly with the number of loads of dishes. The dishwasher uses 32 gallons of water to wash 4 loads of dishes.

How many gallons of water will the dishwasher use to wash 10 loads of dishes?

Which representation shows y as a function of x?

• 
• 
• 
• 

Tags

CCSS.8.F.A.1

Figure I and Figure II are similar quadrilaterals.

Which proportion must be true?

• $\frac{a}{b}=\frac{8}{2}$

• $\frac{3.2}{2}=\frac{a}{8}$

• $\frac{b}{6.4}=\frac{8}{5}$

• $\frac{2}{3.2}=\frac{b}{a}$

Tags

CCSS.HSG.SRT.A.2

The total cost of attending a state university is $19,700 for the first year.

• A student’s grandparents will pay half of this cost.

• An athletic scholarship will pay another $5,000.

Which amount is closest to the minimum that the student will need to save every month in order to pay off the remaining cost at the end of 12 months?

• $404.17

• $612.50

• $820.83

• $1,029.17

Tags

CCSS.8.EE.C.7B

A company sells bottles of vitamin capsules. The graph and table show the linear relationship between the cost per capsule in cents and the number of bottles ordered.

What is the slope of the line that models this situation?

Tags

CCSS.HSF.LE.B.5