SUPER SIMPLE, Please help, I will mark brainliest

Use set buikder notation to represent the following set: {, -2, -1, 0}

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a 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?