Answer:
cosZ=0.8 <---- I don't know what format you need your answer in
Explanation:
Use SOH CAH TOA.
Since you are solving for cos you would want to use CAH which is cos=adjacent divided by hypotenuse.
The adjacent in this triangle is 24 because is is adjacent to the angle you're solving for and isn't the hypotenuse.
The hypotenuse is 30 because it is the side opposite the right angle.
This means the equation is cosZ=24/30 which equals 0.8
Hope this helps! :)
If you need a different answer format feel free to message me and I'll try to help!