I really need help on this pls

With finding limits of multi variable !

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false

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.