What expression can be used to find the total discount? select all that apply. 0.3*42 or 3/10*42 or 0.03*42 or 3 *4.2

0.3*42   this gives you a 30% discount

3/10*42  this gives you a 30% discount

0.03*42 this gives you a 3% discount

3 *4.2  This is not a  discount

each side has a different length.  

step-by-step explanation: