// Only change code below this line
var a = 6;
var b = 15;
var c = "I am a string!";
// Only change code above this line
a = a + 1;
b = b + 5;
c = c + " String!";
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Initialize the three variables a , b , and c with 5 , 10 , and "I am a" respectively so that they will not be undefined .
you variable a and b has the wrong value.
and the value c has to return “I am a String!”, in the line 9 the operator is adding " String!" so you have to give “C” the initial value that is missing.