9 because if you subtract 11 from 19 you het 9
Answer:
314
Step-by-step explanation:
the formula to get the area of a circle is
pi=3.14 and r=10
do you get 3.14 x 
3.14 x 100
314
Answer:
1. Y
2. N
3. N
4. N
Step-by-step explanation:
Let's use the second equation, since it seems to be easier to use.
To check if an ordered pair is a solution, plug it in to the equation.
1.
--> Y
2.
--> N
3.
--> N
4.
--> N
Edit : The 4th equation doesn't work for the first equation, whereas the first one still does.

hope this helps! ask if you have anymore questions
Answer:
-2 4x square is the answer