Write the equation of a circle that has a radius of 1/2 and a center at (1, -1), O (x - 1)^2 + (y - 1)^2 - 1/2
O (x - 1)^2 + (y +1)^2 - 1/4
O (x+1)^2 - (y + 1)^2 - 1/4
O (x + 1)^2 + (y - 1)^2 = 1/2

Step-by-step explanation:

The equation of a circle with center and radius is given by .

What we're given:

Substituting given values, we get:

7

step-by-step explanation:

the answer would be 7

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation: