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A nonessential (nonrestrictive) clause adds extra information that can be removed without changing the core meaning. “Who lives in Dallas” merely adds detail about “my brother,” not identifying which brother uniquely; therefore, it should be set off by commas on both sides: “My brother, who lives in Dallas, is visiting.” Option A omits necessary commas; C places a comma only on one side; D omits the closing comma. On HiSET grammar, decide whether a clause is essential (restrictive—no commas) or nonessential (use commas). If the sentence already pinpoints a specific person (“my brother”), location detail is additional, hence nonessential. Thus, B is correct.

All three revisions fix the error: period, semicolon, or comma with conjunction. So D is correct.

The law of exponents states: am×an=am+na^m \times a^n = a^{m+n}. Here, 23×24=23+4=272^3 \times 2^4 = 2^{3+4} = 2^7. That equals 128. Option A is correct. Option B represents multiplication of exponents (wrong rule). Option C and D exaggerate the values by confusing exponent laws. On HiSET, exponent rules appear frequently. Students must recognize whether to add, subtract, or multiply exponents depending on the operation. Correct answer: A (2^7).

Martin Luther King Jr. advocated nonviolent resistance inspired by Gandhi, leading marches and speeches like “I Have a Dream.” Malcolm X initially promoted more militant stances. Douglass fought slavery in 1800s, Du Bois pushed for education and rights. Correct: B.

The circulatory system, with heart, blood, and vessels, moves oxygen, nutrients, and wastes. Respiratory exchanges gases, digestive breaks food down, nervous controls signals. Correct: C.