Which of the following variable declarations are correct? If a variable declaration is not correct, give the reason(s) and provide the correct variable declaration. (1, 7) 10. double conversion = 2.5; //Line 1 char grade 'B+'; //Line 2 = double 28.5 = num //Line 3 string message = ''First C++ course'; //Line 4 int age = 18 years; //Line 5 int perfectSquare; //Line 6 float x, y, decimal; //Line 7

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