Last summer kevin had $400 im his saving account. After 6 months he had a total of $580 in the account. Using this information, how can you describe the rate of change in the dollar amount in the account per month

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.