After carefully reading through the following excerpt from "hidden figures," answer the question. human computers were meticulous and detail-obsessed number crunchers. they would make the necessary calculations for all aspects of flight and design. sine and cosine, trajectories, curves, fluid dynamics, etc. everything electronic calculators can do now they had to do by hand. they used tables, graphs, mechanical adding machines, and their minds. one human computer would be responsible for thousands of calculations per day. what organizational structure is used here? a. description b. comparison/contrast c. problem/solution d. sequence

This one is a bit tricky because when we read the excerpt we read through descriptions of the types of calculations made.  However, being described first are what the human computers and electronic calculators have in common (a comparison).  What follows is a description of the differences (a contrast) in how the calculations were made.  With that in mind, it can be determined that the organizational structure of this excerpt is that of the comparison/contrast.

compare & contrast informative essay/speech

when speaking or writing for the sole purpose of providing information in order to give audience members a good basis for making a decision, you would present an informative speech or essay.   because you wouldn’t want to be persuading the audience by arguing for one type of exercise over the other, you wouldn’t choose a persuasive/argumentative technique.   to fairly, and without bias, present information about the pros and cons of each type exercise, a compare/contrast, informative speech/essay would be the best bet.