What is answer to 7,433,654 rounded to nearest 100,000

In the figure dhg fhe which statement is true by cpctc

For what value of (y) is 3^3/3^y =1/9

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible