PLEASE PLEASE PLEASE HELP The opening of a train tunnel is shaped like a parabolic arch. The height of the opening is defined by the function h(x) = 6 - 0.4x ^ 2 , where x is the horizontal distance in meters from the centerline of the tunnel How wide is the tunnel's opening at ground level ? Round your answer to the nearest tenth of a meter .

"curse these trig-loving pirates! " devora mutters as she looks at the map. then, after thinking for a moment, she walks back to the entrance of the secret cave, measuring 48 meters along the way. after performing a calculation, devora walks back to the empty treasure, faces the entrance, and turns a certain number of degrees to her left before walking 89 meters to the treasure. supposing that the angle at the cave entrance is acute and that devora's calculations were correct, how many degrees did she turn?