Maria and Sam bought the items shown below .Maria's bill 1 iPad,3 smart watches 4 cellphones. Sam's bill-

$1002

Step-by-step explanation:

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So, I added it as an attachment

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