Wee can you say that a line intersecting the sercle illustrates a secant or tangent​

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

What is the value of f(x) = 2.2 for f(-2)?