Why would |3-6| be 3 instead of -3?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

It says factor each expression completely 8y+48

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?