Question

How do you solve this?

Answer 1

B. 28.1

Explanation:

By the property of intersecting secant and tangent out side of the circle.

`20 * (20 + x) = {31}^(2) \\ 20(20 + x) = 961 \\ 20 + x = (961)/(20) \\ 20 + x = 48.05 \\ x = 48.05 - 20 \\ x = 28.05 \\ \huge \red{ \boxed{x = 28.1}}`