On January 1, 2009, David owed $9,452 to his friend Mackenzie, who was kind enough not to charge David any interest. Each month during 2009, David paid Mackenzie some of the money he owed. If David still owed Mackenzie $5,876 on January 1, 2010, what was the average amount of David's monthly payments?

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.