Explanation:
PART A) 14x + 7 + 9x + 3 + 44 degrees = 180 degrees
add the like terms together
23x + 10 degrees + 44 degrees = 180 degrees
23x + 54 degrees = 180 degrees ( i added the 10 and 44 together to make it easier for me to understand)
minus 54 from both sides:
23x + 54 degrees = 180 degrees
- 54 - 54
that leaves you with:
23x = 126
finally divide 126 degrees by 23 to get x all alone.
the answer is x = 5.47 but you can also round the answer up to 5.5.
PART B)
substitute the letter with the number:
14 × 5.5 or 5.47 = 77 + 7 = 84 degrees