Compare the amount of earth movement (energy released) by earthquakes of magnitudes 4 and 8.
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Please round your answer to the nearest whole.
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One earthquake releases __________ times more energy than the other one.
Fill in the blank(s) with the appropriate word(s).
1,000,000
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Solve the problem.Find the standard form of the equation of the circle. Assume that the center has integer coordinates and the radius is an integer. 
A. x2 + y2 + 2x - 4y - 4 = 0 B. x2 + y2 - 2x + 4y - 4 = 0 C. (x + 1)2 + (y - 2)2 = 9 D. (x - 1)2 + (y + 2)2 = 9
Solve. Use ? ? 3.14 when necessary.A water sprinkler sends water out in a circular pattern. The radius of watering is 9 feet. Determine how large an area is watered.
A. 63.59 ft2 B. 14.13 ft2 C. 28.26 ft2 D. 254.34 ft2
The position of a model train, in feet along the railroad track, is given by 
after t seconds.
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When will the train have moved a distance of 24 feet?
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A. after 15 seconds B. after 22 seconds C. after 10 seconds D. after 16 seconds E. after 19 seconds
Solve the system by substitution.x = 3y + 7y = x - 5
A. (-4, -1) B. (-4, 1) C. (4, -1) D. (4, 1)