How many terms are in the expression 2x + 3y - 4z2x+3y−4z2, x, plus, 3, y, minus, 4, z?

Which is an equation of a circle with center (2, 7) and radius 4? (x - 7)2 + (y - 2)2 = 16 (x - 2)2 + (y - 7)2 = 4 (x – 2)2 + (y - 7)2 = 16 (x + 2)2 + (y + 7)2 = 4