8th grade STAAR Review

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 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.

• The perimeter is 16.4 times the perimeter of Triangle 1, and the area is 8.2 times the area of Triangle 1.

Tags

CCSS.7.G.A.1

What value of x makes this equation true? 0.17x - 0.03 = 0.03x - 0.002

A family has a hot dog cookout every year. 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 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

Tags

CCSS.7.G.B.6

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

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

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

Tags

CCSS.8.G.B.8

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?

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Tags

CCSS.8.EE.B.5

A poster storage tube in the shape of a cylinder has a diameter of 3.5 inches and a volume of 122.52 cubic inches. What is the height of the poster storage tube in inches?

Tags

CCSS.8.G.C.9

CCSS.HSG.GMD.A.3

Which graph represents y as a function of x?

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After x hours of rainfall today, Yvette recorded the amount of rain in inches, y, in a rain gauge. The table shows the linear relationship for the recorded rainfall. How many inches of rain was in the gauge before the rain began today, and what was the rate at which the rain fell in inches per hour? There was a total of inches in the rain gauge before the rain began, and the rain fell at a rate of inches per hour.

• There was no rain in the rain gauge before the rain began, and the rain fell at a rate of 1.25 inches per hour.

• There was 2.5 inches in the rain gauge before the rain began, and the rain fell at a rate of 1.25 inches per hour.

• There was 3 inches in the rain gauge before the rain began, and the rain fell at a rate of 0.75 inch per hour.

• There was 1.5 inches in the rain gauge before the rain began, and the rain fell at a rate of 0.75 inch per hour.

Tags

CCSS.HSF.LE.B.5