So before we find the value of x, let us remember that the sum of two angles is 180 degrees. Now, let us solve for x. 180 = 7x + 2x + 36 180 = 9x + 36 180-36 = 9x 144 = 9x <<divide both sides by 9 and the result would be 16. Therefore x =16. I hope this is the answer that you are looking for. Let me know if you need more help next time.
It would be 4200 x 1.09 which is the interest to the power of 6 for the number of years which would then give you 4200 x 1.09^6. This will then give the answer of 7043.82
