How to convert 1.31 to a fraction

1 Split the number into its whole number component and decimal component.
1.31=1+0.31

2 For the decimal component, 0.31 is the same as 31/100
31/100

3 Combine the whole number component with the fraction

1 31/100

I hope this helps. :)

Have a awesome day. 

X^2 - 4x +(4/2^2) + y^2 + 8y + (8/2^2) = -4 + (4/2^2) + (8/2^2)(x + 2)^2 + (y + 4)^2 = -4 + 4 + 16your center is (-2, -4) and the radius is the sqrt of -4 + 4 + 16 which is 4