I need help please!!

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?

Which of the following is best modeled using a linear equation y=ax+b, where a is less than 0?

If the square of a positive integer is added to 2 times the integer the result is 48. find the integer.