Tell wether the sequence is arithmetic. if it is identity the common difference. 19,8,-3,-14

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′?

2.5 milligrams is equivalent to how many grams

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )