Answer:
7.8
Explanation:
The length x, the side with length 6, and the angle of 40 degrees are related by the trigonometric function cosine, so
[tex]\cos 40=\frac{6}{x}[/tex]
Because x is the hypotenuse and 6 is the adjacent side.
Solving for x, we get
[tex]\begin{gathered} x\cos 40=x\cdot\frac{6}{x} \\ x\cos 40=6 \\ \frac{xcos40}{\cos40}=\frac{6}{\cos 40} \\ x=\frac{6}{\cos 40}=\frac{6}{0.766}=7.8 \end{gathered}[/tex]
Therefore, the value of x is 7.8
