Does someone have the answers

Which equations represents circles that have a diameter of 12 units and a center that lies on the y-axis? check all that apply

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.

Felix wrote several equations and determined that only one of the equations has no solution. which of these equations has no solution?