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QR Challenge: Math 8 QR Rock STAAR

QuestionAnswer
Find the volume of a cone that has a diameter of 6 inches and a height of 10 inches. Use 3 for pi. Be sure to show your work.90 cubic inches
Find the hypotenuse of a triangle that has a leg of 10 cm and a leg of 24 cm. Be sure to show your work.26 cm
A rectangle with an area of 15 square inches is dilated by a scale factor of two-thirds. Find the area of the new rectangle. Be sure to show your work.6 2/3 square inches
Find the surface area of a rectangular prism that has a length of 4 ft, a width of 3 feet, and a height of 2 feet. Be sure to show your work.52 square feet
A triangle has a base of 8 mm and a height of 12 mm. Find the area of a similar triangle that has a base of 6 mm. Be sure to show your work.27 square mm
A student raised her math average from a 75 to a 90. What was the percent of increase? Be sure to show your work.20% increase
If 89 = 4x – 17, what is the value of x? Be sure to show your work.26.5
What is the capacity of a cylindrical barrel that has a height of 2.5 feet and a diameter of 2.4 feet? Use 3 for pi. Be sure to show your work.10.8 cubic feet
Danny walked 9 blocks north to school and then 12 blocks east to the park. What is the shortest distance that Danny can walk home? Be sure to show your work.15 blocks
Is (2, 4) a solution for the equation y = -4x – 4? Show proof.yes
If all the dimensions of a 1-foot cube are doubled, what is the volume of the new cube? Be sure to show your work.8 cubic feet
If a soup can has a height of 5 inches and a radius of 2 inches, what is the area of its label? Use 3 for pi. Be sure to show your work.30 square inches
If a Jeep averages 13 miles to the gallon, how much gasoline would be needed to travel 234 miles? Be sure to show your work.18 miles
If Emma can type 35 words per minute, how long would it take her to type her 770-word essay? Be sure to show your work.22 minutes
If the point (3, -11) is reflected across the x-axis, what are the coordinates of the resulting image? Explain why.(3, 11)
A bag contains 5 red marbles, 3 blue marbles, and 2 yellow marbles. If you take two marbles from the bag (without replacement), what is the probability that they will both be red? Be sure to show your work.2 out of 9
If a triangle with a perimeter of 21 cm is dilated by a scale factor of one-third, what would be the perimeter of the new triangle? Be sure to show your work.7 cm
The dimensions of a rectangular prism that has a volume of 48 cubic feet are all dilated by a scale factor of one-half, what would be the capacity of the new prism?6 cubic feet

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