Give a combinatorial proof that the cardinality of the power set of a finite set a is 2^|a|

Dropping less than two inches per mile after emerging from the mountains, a river drains into the ocean. one day's discharge at its mouth, 5.6 trillion gallons, could supply all of country a's households for seven months. based on this statement, determine how much water an average household uses each month. assume that there are 100 million households in country a. country a uses approximately nothing gallons per household per month.

What is the value of x? enter your answer in the box. (cm)

45 was divided by a power of ten to get 4.5. what power of ten was it divided by? people 4.5