When played, the middle C key on a piano has a frequency of 262 cycles per second. What sine function represents this note when it is graphed with an amplitude of 0.5 unit?
Let x represent the number of seconds.

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When drawing a trend line for a series of data on a scatter plot, which of the following is true? a. there should be an equal number of data points on either side of the trend line. b. all the data points should lie on one side of the trend line. c. the trend line should not intersect any data point on the plot. d. the trend line must connect each data point on the plot.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')