1. a. All you have to do is 1,000-400=600
y=600
b. All you have to do is flip 1/2, which becomes 2/1. 2/1*8=16
p=16
2. I got 5/2 but I'm not sure. But I think it's right.(95% likely it's right)
3. I don't understand number 3.
(14+7.3=x+12.8=8.5)
Hope I helped☺☺