|15 - 13| means to take the absolute value of 15 - 13.
The absolute value means the resulting number without the positive/negative sign.
For example, |15 - 13| is simply 2 in this case. However, |13 - 15| will also be 2. This is because 13 - 15 will result in -2, and we ignore the "-" sign and just take the value 2.
Hence, we have:
|15 - 13| x -5
= |12| x -5
= 12 x -5
= -60
|-10 + 11| (-2 - (-4))
= |1| (-2 + 4)
= 1 (2)
= 2