The diameter of circle a is 9 times as great as the diameter of circle b. the area of circle a is how many times as great as the area of circle b? a) 9 b) 16 c) 81 d) 20 e) 1,543

  C)  81

Step-by-step explanation:

Area of a circle is proportional to the square of the diameter. If the diameter is larger by a factor of 9, the area is larger by a factor of 9² = 81.

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x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x

step-by-step explanation:

last month maria hiked the 5-mile mountain trail a number of times and she hiked the 10-mile canal trail several times. let x represent the number of times she hiked the 5-mile trail, and let y represent the number of times she hiked the 10-mile trail. if she hiked a total of 90 miles, which equation can be used to find the number of times maria hiked each trail? x + y = 90 5x – 10y = 90 90 – 10y = 5x 90 + 10y = 5x