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Add 9: 6x=246x=24. Divide by 6: x=4x=4. Correct answer is C. This is a straightforward linear equation. On ACT Math, systematically isolating variables ensures accuracy.

This question tests verb tense and aspect to show an action that began in the past and continued up to another past moment. The signal phrase “By the time … arrived” sets a reference point in the past. To indicate an ongoing action leading up to that moment, the past perfect progressive (“had been waiting”) is appropriate. Choice B correctly expresses duration prior to a specific past time. Choice A (“waits”) is simple present, mismatched with the past-time marker. Choice C (“has waited,” present perfect) links past action to the present, which conflicts with the clearly past reference point (“arrived”). Choice D (“was waited”) is both the wrong tense and the wrong voice; “wait” is intransitive in this context and does not take a passive form (“was waited” is ungrammatical when referring to people waiting themselves). The ACT frequently uses time markers (“by the time,” “before,” “after”) to cue sequence and duration. When one past action is ongoing and precedes another past event, use the past perfect progressive to show continuity leading up to that later past point.

Redundant phrases such as “at this particular point in time” and “currently” can be simplified. The essential idea is that the team is working on the project. Choice A eliminates all unnecessary words and keeps the meaning. The other choices preserve some redundancy. ACT English often rewards conciseness, so the shortest correct option is usually best.

In a square, diagonal = s2s\sqrt{2}. s=10/2=52s=10/\sqrt{2}=5\sqrt{2}. Area = s2=(52)2=25(2)=50s^2=(5\sqrt{2})^2=25(2)=50. Correct answer: B. ACT Math often uses square properties—know diagonal formulas.

The excerpt shows acknowledgment of mistakes and emphasis on progress. That balance supports Choice B. A, C, and D contradict the passage. On ACT Reading, correct answers often reflect balanced perspectives.