CHALLENGE 3.21: Arithmetic operators. ACTIVITY Reset Concatenate userString1 with userString2 and store the result in the userDate variable. Concatenate userString2 with userNumber and store the result in numberResult var userstring- May// Code tested with values: May and November 2 var userString? 4'; // Code tested with values: 4 and 27 3 var userNumber-7; 11 Code tested with values: 7 and2