What 4 digit number is divisible by both 5 and 9

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?

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?