Final answer:
To fill the given arrays with the specified numbers, we simply write the corresponding numbers in each cell of the array.
Step-by-step explanation:
To fill a 2-by-3 array with ones, simply write the number 1 in each cell of the array like this:
1 1 1
1 1 1
To fill a 3-by-3 array with zeros, write the number 0 in each cell of the array:
0 0 0
0 0 0
0 0 0
Finally, to fill a 2-by-5 array with 7s, write the number 7 in each cell of the array:
7 7 7 7 7
7 7 7 7 7