A young researcher wants to test how well extremophiles, organisms that thrive in extreme conditions, live in different environments. She will do this by putting extremophiles of different species into different solvents. Because of limited lab space, she can run only one sample at a time, and each sample must remain undisturbed for 7 days. To reduce the total time needed to process all samples, the researcher decides to use two acidic solutions along with a control. The information below includes the extremophiles and the solvents the researcher will use in her tests. Species of Extremophiles T. prosperus A. aceti A. brierleyi H. acidophilum T. prosperus A. aceti A. brierleyi H. acidophilum Solvents Name pH hydrochloric acid 1.3 ascorbic acid 4.2 water 7.0 Name pH hydrochloric acid 1.3 ascorbic acid 4.2 water 7.0 Based on the tables, how many days will all of the researcher's experiments take? You may use the calculator. A. 7 B. 21 C. 49 D. 84

Question

A young researcher wants to test how well extremophiles, organisms that thrive in extreme conditions, live in different environments. She will do this by putting extremophiles of different species into different solvents. Because of limited lab space, she can run only one sample at a time, and each sample must remain undisturbed for 7 days. To reduce the total time needed to process all samples, the researcher decides to use two acidic solutions along with a control. The information below includes the extremophiles and the solvents the researcher will use in her tests. Species of Extremophiles T. prosperus A. aceti A. brierleyi H. acidophilum T. prosperus A. aceti A. brierleyi H. acidophilum Solvents Name pH hydrochloric acid 1.3 ascorbic acid 4.2 water 7.0 Name pH hydrochloric acid 1.3 ascorbic acid 4.2 water 7.0 Based on the tables, how many days will all of the researcher's experiments take? You may use the calculator. A. 7 B. 21 C. 49 D. 84

Answer 1

The researcher has 4 species of extremophiles and 3 solvents to test. Since each test takes 7 days and she can only run one test at a time, the total time needed to process all samples would be the product of the number of extremophiles, the number of solvents, and the time for each test. Therefore, the total time required would be 4 (extremophiles) * 3 (solvents) * 7 (days) = 84 days. Hence, the answer is D. 84.

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