I need answers right now

(98 points) i need with 5 questions. answer definitions are welcomed, but not necessary.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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! "?