How is 6 a solution for 2x^2+4x=3+3x^2

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?

If g(x) is an odd function, which function must be an even function?

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points