I need help with this whole thing its way too difficult

The hypotenuse of an isosceles right triangle is $14\sqrt 2$. what is the area of the triangle?

The highest point on earth is the peak of mount everest if you climb to the top you would be approximately 29,035 feet above sea level at remembering that amount is 5280 feet percentage of the height of the mountain would you have to climb to reach a point 2 miles above sea level

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.