In the figure to the right, if AC = 16 and BC = 13, what is the radius?
Some one help pretty please!

Anew fountain in the shape of a hexagon will have 6 sides of equal length. on a scale drawing, the coordinates of the vertices of the fountain are: (7.5,5), (11.5,2), (7.5,−1), (2.5,−1), (−1.5,2), and (2.5,5). how long is each side of the fountain?

Can someone answer this question? : )

Hardest math question of all time can you solve the equation. check for extraneous solutions.9∣9-8x∣ = 2x+3