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# Answer Explanations for: ACT June 2012, Form 70C

This document contains detailed answer explanations to every question from the June 9, 2012 ACT, Form 70C. Many Mathematics and English explanations also link to content pages that explain the relevant grammatical and mathematical concepts in greater detail. Please note that this document contains the explanations only, and does not provide the test questions themselves; it is a tool intended for use with a copy of your test that you purchased from the ACT via the Test Information Release (TIR). The following are sample explanations:

English
1) D) There is simply no need for any commas in this part of the sentence. You must have a reason to put a comma in the sentence rather than a reason not to. Know your comma rules, and if there is no specific reason to use a comma, do not use one. Remember that a comma is not used with a conjunction (such as “and”) unless the conjunction is joining two independent clauses or a list of three or more items, neither of which is the case here, as the “and” is joining two items that are not independent clauses. Answer choice B could be tempting, but the presence of commas on both sides of “and I” indicates that “and I” is a nonessential element of the sentence; however, “and I” is indeed essential, since it is needed in order to accurately state the sentence’s subject. See comma rules.

Mathematics
1) C) A mean is a regular average and can be found using the following formula: (average of set) = (sum of items in set)/(number of items in set). Using this formula, you can calculate the average heart rate by adding together the 8 heart rates and dividing by 8: (130 + 155 + 162 + 148 + 177 + 162 + 170 + 156)/8 = 157.5. See averages.

Reading
2) G) This paragraph primarily serves to give the grandmother’s thoughts and feelings about the Marquesas people’s skin (lines 25 – 26) and way of speaking (27-29). F is incorrect because although this move is mentioned in lines 20-21, no reasons for the move are given. H is incorrect because the paragraph does not mention the grandmother’s level of comfort with the Pa’umotu people; it simply mentions that she has Pa’umotu skin. J is incorrect because although this practice is discussed elsewhere in the essay, it is not discussed in this paragraph.

Science
2) G) The two trials that fit the conditions described in the question are Trial 3 and Trial 9, since both trials have a temperature of 42˚C and a NaCl concentration of 5 g/L, and Trial 3 has a pH of 6 and Trial 9 has a pH of 7. Because Trial 3 has an ACD of .8 and Trial 9 has an ACD of 1.0 mm, raising the pH from 6 to 7 increased the ACD. Continue reading

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