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help with atom and atomic

1.  when the electrons of an atom absorb energy   a.  they move further from the nucleus b.  they increase their potential energy c.  their quantum number...

Word problem

From a point on a river, two boats are driven in opposite directions, one at 9 miles per hour and the other at 8 miles per hour. In how many hours will they be 68 miles apart?

What is the speed?

The speed of a stream is 5 mph. If a boat travels 46 miles downstream in the same time that it takes to travel 23 miles upstream, what is the speed of the boat in still water?

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