STAAR Grade 8 Mathematics

The density of oxygen is 0.001429 grams per cubic centimeter.

How is this number written in scientific notation?

• 1.429 × 10³

• 1.429 × 10²

• 1.429 × 10^-3

• 1.429 × 10^-2

Helen had $330 in her savings account when Vince opened a savings account with zero dollars.

• Helen deposited $30 into her account each week for x weeks.

• Vince deposited $50 into his account each week for x weeks.

• The accounts did not earn interest.

Which inequality represents this situation when the amount of money in Helen’s account was greater than the amount of money in Vince’s account?

• $30x<330+50x$

• $50x>330+30x$

• $30x>330+50x$

• $50x<330+30x$

The height of a cylinder is 5 centimeters. The circumference of the base of the cylinder is $16\pi$  centimeters.

Which measurement is closest to the volume of the cylinder in cubic centimeters?

• 251.3 cm3

• 4,021.2 cm3

• 1,005.3 cm3

• 628.3 cm3

Which graph appears to show a proportional relationship between x and y?

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• 
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Which point best represents the value of $\sqrt{3}$  ?

• Point A

• Point B

• Point C

• Point D

The side lengths of the base of a triangular prism are 5 meters, 8 meters, and 10 meters. The height of the prism is 16.5 meters.

What is the lateral surface area of the prism in square meters?

The table shows the linear relationship between the number of hours Francis worked, x, and the amount of money Francis earned, y.

Based on the table, how much did Francis earn per hour?

• $17.50 per hour

• $14.00 per hour

• $35.00 per hour

• $24.50 per hour

Four triangles are shown. One side of each triangle lies on a ray, and the triangles are not drawn to scale.

Based on these triangles, which statement about x is true?

• x = 160 because $180-\left(130+30\right)=20$ and $180-20=160$

• x = 20 because $130+30=160$ and $180-160=20$

• x = 80 because $180-130=50$ and $50+30=80$

• x = 340 because $130+30=160$ and $160+180=340$

The scatterplot shows the time spent playing a video game and the number of points scored by several students.

Based on the scatterplot, which is the best prediction of the number of points scored by a student who spends 45 minutes playing the video game?

• 1,200

• 920

• 1,060

• 1,300

The length of a rectangular frame is 15 inches, and the width of the frame is 8 inches.

What is the length of a diagonal of this frame in inches?