Question

Is this correct?
Attachment~

Answer 1

\[\cos 50=\frac{280}{AC}\]
\[AC=\frac{280}{\cos 50}\]

Answer 2

\[\frac{1}{\cos 50}=\sec 50\]

Answer 3

So:
\[AC=280\sec 50\]

Answer 4

I think i need to reveiw this lesson...a lot. Thank you!

Answer 5

yw