Step-by-step explanation:
f = 2 is the correct answer
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8 7/16 - (-2 4/9) =
8 7/16 + 2 4/9 =
8 7/16 = 135/16 = 1215/144
2 4/9 = 22/9 = 352/144
1215/144 + 352/144 = 1567/144 =10 127/144
Your answer should be 157.5 Inches
There u just needed to search the formula
The angle vertical to it is DF