R=2K which equals 2R=4K
4(R=K+8) or 4R=4K+32
Subtract first equation from second equation.
2R=32 so R=16
Plug into first equation
16=2K so K=8
Now plug both into second equation to check
4R-4K=4(R-K)=4(8)=32 it works
So Roberto is 16 and Katie is 8
(In 4 years R would be 20 and K would be 12 which has a difference of 8)
Answer: The required expression she is on after d days is 
Step-by-step explanation:
Since we have given that
Page number at which she is = 88
Number of pages she will read every day = 20
Let the number of days be 'x'.
According to question, it becomes

Hence, the required expression she is on after d days is 
Answer: The statue is 9 feet tall.
Step-by-step explanation: Just double all of your values because 12 is 6x2.
Answer:
K (6,8)
Step-by-step explanation:
You just change the signs of y if your only reflecting over the y-axis. If you were reflecting over x then the 6 would be negative but your only doing the y so it makes the 8 positive.