WorkArea Results Instructions Assume that x is a char variable that has been declared and already given a value. Write an expression whose value is true if and only if x is a upper-case letter. Submit...

I did not understand this question, and the solution in the picture is the correct answer. Please explain to me. This is c++ homework. Thank you.

Extracted text: WorkArea Results Instructions Assume that x is a char variable that has been declared and already given a value. Write an expression whose value is true if and only if x is a upper-case letter. Submit History: (6 of 6) 03/08/22 02:12:40 1 (x>='A' && x<>