15(cos 206° + i sin 206°) answer in a+bi form

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

Do you mind if you guys me with this question i’m on number 8