Answer:
x = 4
FE = 8
Explanation:
Congruent means equal. Notice how both F and C equal 30 degrees while line AC and line DF are both equal to 9 inches. This means we can equal line CB to line FE to find the value of x:
2x = x + 4
Isolate variable x by subtracting both sides by x:
2x - x = x - x + 4
x = 4
Check your work:
2(4) = 4 + 4
8 = 8
Correct