Answer: [tex]x=56.5\ km[/tex]
Step-by-step explanation:
Given the right triangle in the image, you need to remember the following identity:
[tex]cos\alpha=\frac{adjacent}{hypotenuse}[/tex]
Observe the triangle. You can identify that:
[tex]\alpha=28\°\\adjacent=x\\hypotenuse=64[/tex]
Then, knowing these values, you can substitute them into [tex]cos\alpha=\frac{adjacent}{hypotenuse}[/tex]:
[tex]cos(28\°)=\frac{x}{64}[/tex]
Finally, you have to solve for "x".
Therefore, the value of "x" rounded to the nearest tenth is:
[tex]64*cos(28\°)=x\\x=56.5\ km[/tex]
