Solving systems of equations help.

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?

In the xy-plane, if the parabola with equation passes through the point (-1, -1), which of the following must be true?

What is the 17th term in the arithmetic sequence in which a6 is 101 and a9 is 83