Computers have changed quite a bit through the years in early model could at 18 million numbers per hour one person could have needed many years to do the same job a modern computer could add one and a half trillion numbers in less than 3 hours. what is the main idea? a. who uses computers. b. how long one person takes to do a job. c. how computers have gotten faster overtime. d. how fast modern computers can add.

C and D, I f I had to choose one, then I'd go with C because D is redundant. If computer have gotten faster over time, then it's inherent that a modern computer would be faster than a previous one, hence computers have gotten faster over time. C

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the answer is subjective. i personally agree with the first answer for this question.

if one isn't strictly talking about objects then the correct answer would be 'my eyes' since according to this riddle i am asleep and in order to answer/open the door i need to open my eyes first of all.

however, if one is specifically looking for an object, then the first thing i would open would be the door

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