How many ways are there to make a line of 3 teachers and 8 students if a teacher must be at the front of the line

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?

Maurice has 54 fewer comic books than rebecca.they have 130 comic books together .how many comic books are in maurices collection ? how many comic books are in rebeccas collection

Find the value of x. give reasons to justify your solutions! l, m ∈ kn