Last year, debra opened an investment account with 8400. at the end of the year, the amount had increased by 21.5%. how much is this increase in dollars? how much money was in her bank account at the end of last year.

Sandy is upgrading her internet service. fast internet charges $20 for installation and $52.45 per month. quick internet has free installation but charges $57.45 per month. part 1 out of 2 complete the equation that can be used to find the number of months after which the internet service would cost the same. use the variable x to represent the number of months of internet service purchased.