Write the standard form of the equation of the circle.The endpoints of a diameter are (3, 4) and (7, 4).

A. (x + 5)2 + (y + 4)2 = 4
B. (x - 5)2 + (y - 4)2 = 4
C. (x + 5)2 + (y + 4)2 = 2
D. (x - 5)2 + (y - 4)2 = 2


Answer: B

Mathematics

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A cleaning process is removing salt from a pool. The amount S, in pounds, of salt remaining after t hours is given in the following table. Use exponential regression to determine the amount of salt remaining after 19.82 hours. Round your answer to two decimal places.  t 1.54 5.04 8.82 12.81 15.82 S 20.73 11.71 6.58 3.46 2.92?

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Identify the sampling technique used to obtain a sample.A group of people are classified according to height and then random samples of people from each group are taken.

A. Systematic sampling B. Stratified sampling C. Convenience sampling D. Random sampling

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