When do you use the = sign, when do you use the equals sign and when do you use the ident sign with 3 lines?
I just don't understand the difference. My teacher says it has something to do with the valid digits, yeah, that's clear, but my thought: 1yd=4ft Within the limits of measurement accuracy, 1 yd can be 0.5 yd up to 1.5 yd, resulting in a tolerance range between 2 and 6 feet, for example. So why…