Serafina had 30 stickers. She gave the same number of stickers to each of her 3 friends. Now she has 18 stickers left. How many stickers did she give to each friend?

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?

Answer for 10 points show work you guys in advanced < 3

Solve the triangle. a = 21°, c = 105°, c = 5