What is the 8th term of the geometric sequence with this explicit formula? an= 7• (-2) (n - 1)

Aman is 6 feet 3 inches tall. the top of his shadow touches a fire hydrant that is 13 feet 6 inches away. what is the angle of elevation from the base of the fire hydrant to the top of the man's head?

Im literally having a mental breakdown

What is the result of adding the system of equations? 2x+y=4 3x-y=6