Every rectangle with four congruent sides is a square

Which matrix can be multiplied to the left of a vector matrix to get a new vector matrix ?

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

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?