the quiz in week 2 doesn’t load well. I tried different browsers and no fixation. questions appear to me like this question :

“Suppose our input batch consists of 8 grayscale images, each of dimension 8x8. We reshape these images into feature column vectors $$\mathbf{x}^{j}$$. Remember that $$X = \begin{bmatrix} \mathbf{x}^{(1)} \mathbf{x}^{(2)} \cdots \mathbf{x}^{(8)} \end{bmatrix}$$. What is the dimension of $$X$$?”

I don’t know what to do