GRE

简答题 For this question，indicate all of the answerchoices that apply．
Which of the following equations are equivalent t0 x2+1=2x?

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B．C．
The equation x2+1=2x can be rewritten as x2—2x+1=0，factored into(x-1)2=0，andsimplified into X-1=0 by taking the square root of both sides．Thus any equation whose only solution is X=1 will beequivalent tothis one．This is the case for (x-1)3=0 and X+1=2．Choice E also has x=-1 as a solution．Choice D is true no matter what x mav be，notjust X=1．

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1 When company X ships a dozen eggs，there is a 3%chance that exactly oneegg will be broken，a 0．5%chance that the whole dozen will bebroken，butno chance that any other number of eggs willbe broken．If 1，000 dozeneggsare ordered from company X．how many broken eggsshould be expected?

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2　　Huntington’sdisease is by far most prevalent in peopleof Western European
descent．Its onset typically presents as lack ofcoordination and a jerky gait．Often， symptoms are nonexistent until the carrier of the mutation is in hisor her late 30s． Line After that，the patient’sdecline may be slow or rapid，eventually resulting in(5)physical and mentaldegeneration．Although everyone carries the gene known as huntingtin，veryfew carry the mutation that results in the disease．Ifone parent carries the mutation，each offspring has a 50．50 chance of inheriting the mutated gene．Genetictesting and counseling are often recommended for family members of Huntington’s patients． (10)The test uses a blood sampleto isolate the huntingtin gene and count the number of CAG repetitions in thatgene．Forty ormore repeats usually means that the person carries the disease．
Consider each of the choicesseparately and select all that apply． 根据以上内容，回答题。
If a father of four children carries theHuntington’s mutation，which ofthese is tnle?

Select one answer choice．

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3 Based on information from the passage，which of these people would be
MOST likely to develop Huntington’s disease?

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