9.………reduce the amount of energy and time required to do that work.

i'd have to with d.

explanation:

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.

answerthe same historical circumstances;