Respuesta :
When It's subtraction, add the opposite. So it becomes 4 + -5, which is negative 1. So keep the first number the same, change the sign to addition, and flip the sign on the other number.
When It's subtraction, add the opposite. So it becomes 4 + -5, which is negative 1. So keep the first number the same, change the sign to addition, and flip the sign on the other number.