rawand

the sum is 19.my hundrends digit is 4 less than 7. my thousands digit is the sum of 3 and 1. the other two digit are the same number. what four digit number am I?

Anonymous answer rating percentage100% Figure 22-21 shows two square arrays of charged particles. The squares with edges of 2d and d are centered at point P and are misaligned. The particles are separated by either d or d/2 along the perimeters of the squ...

can you explain to me better, please? thank you so much