Need help with this. Please

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Which expression is equivalent to 3^3 + 2^2?

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′?