*a) I tried to have WebWork calculate the transpose of a matrix, but I got the error "Can't locate object method "transpose" via package "Value::Formula"" which makes it sound as if I can't use matrix operations with variable names in them.*

*b) So I punted and just entered the transpose myself, but now when I have WebWork display the matrices so the students can enter them, the ones with variables in them don't display as a matrix, but simply as a single blank. See attached image.*

*c) Is there a better way to do the 'impossible' case?*