Is the symbol (x¯¯)  used for the population mean or sample mean? choices population meansample mean

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.

Write the pair of fractions as a pair of fractions with a common denominator

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?