Let us consider first part,
Add -4.5 and 3.5
= - 4.5 + 3.5
When two integers are subtracted, the sign(positive or negative) of the answer will be the sign of the larger number.
So, -4.5 + 3.5 = -1.0
Let us consider second part,
We have to determine the value of, -4.5 increased by 3.5
= -4.5 + 3.5
= -1.0
Let us consider third part,
We have to determine the distance between -4.5 and 3.5
= 3.5 -(-4.5)
= 3.5 + 4.5
= 8.0
So, the distance between -4.5 and 3.5 is 8 units.
Let us consider the fourth part,
We have to find the sum of -4.5 and 3.5
= -4.5 + 3.5
= -1.0
Third part is different from the other parts of the question.