I need help fast help me ASAP

https://www. khanacademy. org/math/cc-seventh-grade-math/cc-7 th-geometry/cc-7th-unknown-angle-al gebra/e/find-missing-angles

Joseph haydn pet store offers wide variety of leashes for dogs. the store purchases one popular type of leash from its manufacturer for $4.38 each. joseph haydn pets marks up leashes at a rate of 238% of cost. what is the retail price of the popular leash?

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Pls never taught i’m really confused and i rlly need