Answer:
3.81 = 3 81/100
Step-by-step explanation:
This can’t be simplified so it stays as 3 
I’m thinking your r in the first equation is actually an x.
X + 2(2x -4) =10
X +4x -8 =10
5x = 18
Answer: 0
Step-by-step explanation: -6.80 + 6.80
Negative numbers act as subtracting
Answer:
y = 3x
Step-by-step explanation:
sorry cant do the graph