Simplify. write each answer in sciei notation. i 1) (7.23 x 10^-3)^3 2) (4.2 x 10^3)^-3 how am i supposed to solve this

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?