this 2 questions are confusing me. if anyone could do it with an explanation. it would be a huge help

1.

Write a formula for the general term or nth term for the sequence. Then find the indicated term. 4, 6, 8, 10, 12, ...; 210 an E (Simplify your answer. Type an expression using n as the variable.)Solve the system algebraically. 4x - 5y = 38 3x + 7y = 7 Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The solution is x = and y = (Simplify your answer.) O B. There are infinitely many solutions of the form x = and y = r. (Simplify your answer. Type an expression using r as the variable.) O C. There is no solution