6/54 times because there are 9 marbles and the orange marble is 1 out of those 9 marbles. If you multiply 6*9= 54 then you notice there is a 6/54 chance of picking any 1 marble out of the 54 times that you decide to pick marbles.
we know that in the triangle ABC ∠A+∠B+∠C=180° ∠C=180-(86+69)-----> ∠C=25° Applying the law of sines b/sin B=c/sin C------> b=c*sin B/sin C-----> b=82*sin 69/sin 25 b=181.14 ft