Mark has 312 books in his bookcases. he has 11 times as many fiction as nonfiction books. how many fiction books does mark have?

What is the value of 1/3x + 7x when x = 5

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

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′?