How do u write 2.51 in expanded and word form

How do i do this activity, is appreciated

Asailor is looking at a kite. if he is looking at the kite at an angle of elevation of 36and the distance from the boat to the point where the kite is directly overhead is 40 feet, how high is the kite?

Select the quadratic that has root x = 8 and x = -5