a box can holds 4 rows of 5 cubes in its first layer which expression should i use to get my answer

What is your question?

4*5

To find the total number of cubes a box can hold based on the given information, you need to multiply the number of rows by the number of cubes in each row.

The expression to calculate the total number of cubes the box can hold is:

Number of rows × Number of cubes in each row

In this case, the box can hold 4 rows, with each row containing 5 cubes. Therefore, the expression would be:

4 × 5 = 20

So, the box can hold a total of 20 cubes.