Question

What is answer to this very hard question

Answer 1

66.4

Explanation:

Hope this helped!

Answer 2

Check the picture below.

`cos(Y )=\cfrac{\stackrel{adjacent}{6}}{\underset{hypotenuse}{15}}\implies cos(Y)=\cfrac{2}{5}\implies cos^(-1)[cos(Y)]=cos^(-1)\left( \cfrac{2}{5}\right) \\\\\\ Y=cos^(-1)\left( \cfrac{2}{5}\right) \implies Y\approx 66.4^o`

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