A railroad crew can lay 5 miles of track each day. They need to lay 145 miles of track. The length, L (in miles), that is left to lay after d days is given by the following function. =Ld−1455d

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.