The value of a home in 2015 was $400,000. Its value has been doubling each decade.
If v is the value of the home, in dollars, write an equation for v
in terms of d, the number of decades since 2015.

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! "?