For a research project on time management, Yuri needs to calculate how many hours the average high school student spends in school each year. Which of these dimensional analysis equations is the correct one for him to use?

explanation:

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.