Circle G is shown. Line segment F G is a radius with length 3. In circle G, r = 3 units. Maria draws a circle with double the area of circle G. What is the area of Maria's circle? 6Pi units squared 9Pi units squared 12Pi units squared 18Pi units squared

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On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?