Nora is comparing the number of trading cards she has with her friend Kaiden. Originally, Nora had four times as many cards as Kaiden had. She then got eight additional cards for her birthday. If Kaiden had 11 cards when they did their comparison, how many did Nora have after her birthday?

Need ! give step by step solutions on how to solve number one \frac{9-2\sqrt{3} }{12+\sqrt{3} } number two x+4=\sqrt{13x-20} number three (domain and range) f(x)=2\sqrt[3]{x} +1

Cassie is traveling 675 miles today to visit her brother and his family. so far, she has stopped for gas three times. at the first stop, she put in 7.1 gallons of gas and paid $23.79. at her second stop, she put in 5.8 gallons of gas and paid $19.08. and, at the third stop, 6.6 gallons and paid $20.39. at which stop did casey pay the most for gas?

Ineed if you could explain and give me the answer you! this needs done