If the length of ab = 16 cm and the length of bc = 4 cm, what is the length of cd? (note that ab is tangent to circle f.)

Hello, is the attached figure the same with yours? since ab is tangent to the circle and there are two points in the second line (point c and point d), the second line is assumed to be a secant.ab^2 = bc x bd16^2 = 4 x bd256 = 4 x bdbd = 64to get cd, deduct bc from bd.cd = bd - bccd = 64 - 4cd = 60

Then why is the question on here if you know the answer

paul's with a y-intercept of $ 2856