These answers are wrong so can someone

Well for a, it would be 30x+6x+10 beacause you’re finding perimiterand the second one would be like 75xx+75x, and then the third one you solve, the equation would be45x14, and you would do the math to get 630

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