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What is the mean for this list of numbers? 4, 8, 18

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Why do interests rates on loans to be lower in a weak economy than in a strong one

The final cost of a sale is determined by multiplying the price on the tag by 75%. which best describes the function that represents the situation?