49 5/8 or, if you would like it in decimal form, 49.625
We can see that the kite should be perpendicular to the water. And so the other angle will be 60 degrees. It's a special triangle. So if the length of the kite is 85m then the length of the kite above water is 85/2
According to the graph the answer is : y = 2.5x + 5