Answer:
Gray's mistake is that he improperly put the wrong numbers for the values of adjacent/hypoteneuse.
Step-by-step explanation:
The correct answer is 65.78
[tex]cos^{-1}(\frac{16}{9}) \\=65.779\\Round it up \\65.78[/tex]
1) Gray used the wrong placement in the formula for numerator / denominator, as formula for cos is [tex]\frac{adj}{hyp}[/tex] and he did [tex]\frac{hyp}{adj}[/tex].
2) Correct answer is 65.78° -- [tex]cos^-1(\frac{16}{39})[/tex]
