County Y consist of two districts. One district has an era of 30 square miles and a population density of 370 people per square
mile and the other has an area of 50 square miles a popular destiny of 390 people per square mile. What is the population destiny, in people per square mile, for all of county Y ?
M to millimetres is 3 steps. m > dm > cm > mm. since it is 3 steps down, the comma goes 3 places left. 4 > 0,4 > 0,04 > 0,004. so 4 m is equal to 0,004 mm
