Lisa has dinner at a restaurant. She receives her bill and multiplies the amount by 1.25 to find the total cost, including the tip.
What percentage of the bill did Lisa tip?

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.