Question

Prove that the set  Z4 = 0 , 1 , 2 , 3 is a commutative ring with respect to the  binary operation addition modulo and multiplication modulo  +4 and *4​

Answer 1

Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat, or light.