Answer:
1. Sometimes
2. Always
3. Jamal thought that subtracting a negative number makes the number positive, not that subtracting a negative number means its adding the absolute value of the number.
Step-by-step explanation:
For problem number 1, the answer would be sometimes. If the number you are subtracting is less then the number you are subtracting is from then yes, if the number you are subtracting is greater then the number you are subtracting it from then yes., If the number you are subtract is a negative number greater then the number you are subtracting it from then no. 4- (-7) = 11 which is greater then both 4 and -7
For problem 2, the answer is always. Subtracting a negative is just adding so writing 4-(-7) could be written as 4+7 or 4+|-7|
For problem 3, the thing we learned in problem two shows us his mistake. 10-(-10) is not 10-10, its 10+10 or 10+|-10|
