Answer:
1. -2
2. -17
3. -17
4. 5
5. -20
Step-by-step explanation:
1. 3+(-5)
solution: 3 is positive and 5 is negative, since they have different sign we need to subtract it and copy the sign of the biggest number
2.-9 + (-8)
solution: 9 and 8 have the same sign - negative so we need to add it and simply copy the negative sign to the answer.
3. -12-(5)
solution: if you look at the numbers in here they have different sign, this number here is positive (5) but take a look at the sign outside the ( ) it's negative that's why the 5 in here is considered as negative , other way to solve this is simply crash out the ( ) and get the answer
-12 -5
= -17
4. 7-(-2)+(-4)
solution: let's start with 7-(-2) in math even though they have different sign didn't mean that you can subtract them take a closer look, the positive sign has the bigger value which is 7 than the negative sign and also the - sign outside the (-2) makes it more obvious that it's not addition so 7-(-2)= 9, next 9 + (-4), the + sign outside the ( ) and the - sign inside the ( ) contradict each other it means subtract so 9-4= 5 and that we got the answer.
5.-18+(6)-(8)
solution: let's start with -18+(6), the negative has a bigger value which is 18 than the positive so -18+6= -12, next -12-(8), simply crash out the ( ) so it's -12-8 since they have the same sign add them and put negative sign to the answer that's why the answer is -20.
