Eric's computer slows down when he opens several computer programs. why does this happens

Eye injuries usually occur as a result of all of the following things, except: a) proper machine operation b) battery explosion c) falling or flying debris d) electric welding arc

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Peter is thinking of a number which isless than 50. the number has 9 factors.when he adds 4 to the number, itbecomes a multiple of 5. what is thenumber he is thinking of ?