Could i get an explanation on how to do this?

What is the product of the radical expression. (7-2square root) (8+2 square root)

Use the knowledge of x- and y- intercepts to choose the correct graph of the equation 3x+6y=6

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?