8th Grade Math Practice STAAR

Triangle 1 is dilated by a scale factor of 4.1 using the origin as the center of dilation to create Triangle 2. Which statement about the area and perimeter of Triangle 2 is true?

• The perimeter is 4.1 times the perimeter of Triangle 1, and the area is 4.1 times the area of Triangle 1.

• The perimeter is 8.2 times the perimeter of Triangle 1, and the area is 8.2 times the area of Triangle 1.

• The perimeter is 4.1 times the perimeter of Triangle 1, and the area is 16.81 times the area of Triangle 1.

• The perimeter is 16.4 times the perimeter of Triangle 1, and the area is 16.81 times the area of Triangle 1.

What value of x makes this equation true? 0.17x - 0.03 = 0.03x - 0.002. Record your answer in the space provided.

The scatterplot shows the number of people who have attended each cookout and the number of hot dogs that were eaten each year. This year 45 people are expected to attend the cookout. Based on the scatterplot, about how many hot dogs should the family prepare?

• 83

• 52

• 36

• 40

A gas company charges a $16 monthly service fee and $0.6924 per hundred cubic feet of natural gas used during a month. Which equation best represents y, the gas company's monthly charges in dollars for using x hundred cubic feet of natural gas?

• y = 0.6924x - 16

• y = 16x + 0.6924

• y = 16x - 0.6924

• y = 0.6924x + 16

Which set of side length measurements in meters does NOT make a right triangle?

• 9 m, 11 m, 13 m

• 18 m, 24 m, 30 m

• 7 m, 24 m, 25 m

• 20 m, 21 m, 29 m

A faucet leaks 0.8 gallon of water every 2 hours. Which graph has a slope that best represents the number of gallons per hour leaked by the faucet?

• Graph A

• Graph B

• Graph C

• Graph D

A poster storage tube in the shape of a cylinder has a diameter of 3.5 inches and a volume of 122.5π cubic inches. What is the height of the poster storage tube in inches?

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Which graph represents y as a function of x?

• Graph A

• Graph B

• Graph C

• Graph D

A triangular prism and its dimensions in centimeters are shown in the diagram. What is the total surface area of the prism in square centimeters?

• 720 cm²

• 600 cm²

• 460 cm²

• 520 cm²

The total annual cost to attend a community college is $4,000. The college offered a high school senior a scholarship for $1,500. The student can get a student loan for $1,000 but will need to earn enough to pay the remaining cost. It is 5 months until the remaining cost must be paid. What is the minimum amount the student needs to earn per month to save enough money to pay the remaining cost?

• $300

• $600

• $500

• $800