84÷2=42. 84÷3=28. 84÷4=21. 84÷6=14. So your answer is true.
Black or blue pen would be appropriate.
Change is what is left over
ex. the cashier tells you "here is your leftover change sir/ma'am "<span />
A barcode's bars have
1. different thicknesses, so they each signify 1 or 2 nibbles.
2. the combinations of the thicknesses of those bars exceed the trillions. That's why manufacturers and stores never run out of SKU barcodes.
Mother board
Because that’s where all the processing takes place
