Can someone solve this please

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?

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.