Informal language is fine. Some of these things don’t even require complete sentences.
Assessment and grading:
When I assess these exercises I will be looking for accuracy and evidence of care and thought in pursuing the analytical portion. You will receive a + if the exercise has been completed in an unusually thoughtful manner. You will receive a if everything meets the basic expectations. You will receive an X only if you do not complete some portion of the exercise, or complete something in a manner that is inaccurate or generally not up to college level work.