I assume you mean what percentage it is? if so:
225/450 = 50%

You need to use the equation for adding fractions, which is

In this case, a=-1, b=3, c=-3, d=5.

simplify
answer:
Answer: look at the picture
Step-by-step explanation: hope this help
Answer:
I think they first one is .5 and I'm not sure on the other