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You need to determine whether the triangles are congruent by ASA, SSS, SAS, AAS or HL. Then you can say that the triangles are congruent; after that, you need to go back to what the were asking you to prove, for example, if they were asking you to confirm that AC and GD were congruent, state that they are congruent and then put CPCTC as a reason. Am I making sense?
6,609,707 rounded to the nearest ten thousand is 6,610,000. It's because 6,609,707 is closer to 6,610,000 than to 6,600,000.
147,779 rounded to the nearest ten thousand is 150,000. It's because 147,779 is closer to 150,000 than to 140,000.
For Example, 23 is a common way to say it.
Another way is 20+3, which is expanded form.
D. the question implies the fact the furnace is in bad shape. It would cause readers to infer it needs replaced. So he needs to replace the furnace. hope im right