Respuesta :

wegnerkolmp2741o

Answer:

13.1

Step-by-step explanation:

(whole secant) x (external part) = (tangent)^2

(x+8) * 8 = 13^2

8x+64 = 169

Subtract 64

8x = 105

Divide by 8

8x/8 = 105/8

x =13.125

To the nearest tenth

x =13.1