Write as an algebraic expression and simplify if possible:
A number that is 20% greater than b

Which expression is equivalent to 4 square root 6 divided by 3 root 2

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′?

Asap! i'm not good math and i'm lost.