Estimate the angle of elevation from the trailhead to the summit.

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Is the power produced directly proportional to the wind speed, give reasons for your answer?

Can anyone explain to me how to do this? anything will .