The line segment is rotated 270 degrees counterclockwise about the origin to form a'b'. which statement describes a'b'? a.) a'b' is parallel to ab. b.) a'b' is half the length of ab. c.)a'b' and ab are equal in length. d.) a'b' is greater than twice the length of ab.

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)