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Both Macbeth and Julius Caesar were written by:

William Shakespeare is widely regarded as the greatest writer in the English language and the world's greatest dramatist. Source

I understand that you don't understand the question. To help you, could you please provide the question you're referring to? I need the question to be able to explain it to you.

The symbol used to denote molarity is M.

Molarity is defined as the number of moles of solute per liter of solution. A 1 M solution contains one mole of solute per liter of solution.

For more information, refer to:

• LibreTexts: Molarity

No, a square matrix A is not invertible if its determinant |A| is equal to 0. A matrix is invertible (also known as non-singular or non-degenerate) if and only if its determinant is non-zero. If the determinant is zero, the matrix is singular and does not have an inverse.

Invertibility requires that the matrix represents a transformation that can be "undone." When the determinant is zero, it means the matrix collapses space (or at least reduces its dimension), making it impossible to reverse the transformation uniquely.

You can explore more about invertible matrices and their properties on websites such as:

• MathWorld: Invertible Matrix
• Wikipedia: Invertible Matrix