Old phone numbers in the U.S. had letters to denote the telephone exchange that handled any given number, a practice that lasted until the late 1970s.

Any letter or number to the power of zero is equal to 1. This can be seen in the example of \(j^2 \div j^2\). Subtract the powers, so \(j^2 \div j^2 = j^{2 - 2} = j^0\). Any number or letter ...

GCSE; Eduqas; Laws of indices - Eduqas Letters or numbers to the power of zero. Using indices, we can show a number times itself many times or as another way of writing a square or cube root.