Answer:
See each problem number below for answers.
Explanation:
To solve this problem, we must remember the rules of addition and subtraction. If we are adding a negative, this is the same thing as subtracting a positive number (because subtraction is defined as the addition of a negative number). In addition, if we are subtracting a negative number, the two negative signs cancel each other out, and we are left with addition of a positive number. Let's use these rules in the problems you have given.
1) 2 - (-73)
Since the subtraction of a negative is the same as addition, we can rewrite this as:
2 + 73
which is a simple computation and leaves us with:
75
2) 39 + (-20.4)
The addition of a negative is the same as subtraction, so we can rewrite this as:
39 - 20.4
which is a simple computation and yields:
18.6
3) 67.086 - (-20)
The subtraction of a negative is the same as addition (similar to problem 1)
67.086 + 20 = 87.086
4) 60 + (-19)
The addition of a negative is the same as subtraction (similar to problem 2)
60 - 19 = 41
5) 87 - 64.05
This is a simple subtraction problem, the computation gives us the answer of:
87 - 64.05 = 22.95
Hope this helps!