Quadrilateral A'B'C'D' is the image of quadrilateral ABCD under a dialtion with a scale factor of 4

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.

Can someone me i’m confused. will give brainliest and a whole bunch of points

Write a story that matches with the expression 42x-5 pls hurry