As discussed in the lecture notes, stacks are a very commonly used abstract data type. applications of stacks include implementation of reverse polish notation expression evaluation and undo buffers. stacks can also be used to check whether an expression has balanced parentheses, braces, and brackets (,{,[ or not. for example, expressions with balanced parentheses are "(x + y)", "{x + (y + z)}"

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Drag the tiles to the correct boxes to complete the pairs. match the errors with their definitions. #name #value #ref when a formula produces output that is too lengthy to fit in the spreadsheet cell arrowright when you enter an invalid cell reference in a formula arrowright when you type text in cells that accept numeric data arrowright when you type in a cell reference that doesn’t exist arrowright reset next