21x―18y+11 can you help me

Can someone me with my math problem pls my teacher is on my back about this

Given: ab ≅ bc and ao ≅ oc ok − angle bisector of ∠boc find: m∠aok

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.