Anything except pi is a rational number. So 9 and 7/10 is one or it could be a whole number
To the nearest tenth = 4.4 and to the nearest whole number is 4. Whatever estimation it asks you.
Answer:

Step-by-step explanation
The standard equation of a circle centered at origin is 
r = radius of the circle
The circle is passing through the point (0,5)
∴ radius 



∴ The equation of the circle is

Answer:
For every x y is cut in half