If xy =1 show that dy/dx=-1/x²

Which spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1

An expression for the average of x 2x and 3y

Abank manager wants to encourage new customers to open accounts with principals of at least $2 comma 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! "?